Add changelog / prepare release v0.2.1

Author: dalito

CHANGELOG.md

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+# Changelog
+
+This changelog provides a high-level overview of changes.
+From v0.2.0 onwards, the versioning follows the principles of [Semantic Versioning](https://semver.org/).
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
+
+<!-- possible sections:
+    Added       for new features.
+    Changed     for changes in existing functionality.
+    Fixed       for any bug fixes.
+    Deprecated  for soon-to-be removed features.
+    Removed     for now removed features.
+    Security    in case of vulnerabilities.
+-->
+<!--
+## Unreleased
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/compare/v0.2.1...main)
+-->
+## Release [0.2.1] - 2025-02-16
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/compare/v0.2.1...v0.2.0)
+
+[0.2.1]: https://github.com/dalito/linkml-project-copier/releases/tag/v0.2.1
+
+### Added
+
+- Notes on updating from 0.1.x to 0.2.x to [README.md](./README.md#notes-on-specific-updates).
+- Developer tools: Repo and generated project now have a pre-commit configuration with sections for yamllint, typos, ruff (only in project) and some basic checks from pre-commit itself. #50
+- Typos spell checker as gh-action for the repo (but not for the generated project). #50
+- Added a README to the schema subfolder so that it is added to git even in absence of a schema file.
+
+### Changed
+
+- All yes/no question are now treated as type bool in copier.
+- Ignore also `docs/index.md` and `docs/about.md` when updating with copier.
+- Make Python test for example schema/datamodel more general.
+- Make `just gen-project` a visible command (it was already present but hidden).
+- Improved yamllint configuration and reformatted all non-conforming yaml files in the project. #50
+- Change license of linkml-project-copier from CC0 to MIT. #49
+
+### Fixed
+
+- Syntax of `just setup` recipe.
+- Invalid just recipe name for migrating from 0.1.x to 0.2.x which prevented execution on copier update.
+- Excessive whitespace generation in jinja-templates (e.g. in LICENSE files)
+- Some LICENSES were not correctly copied to the generated project. #52
+- Wrong jinja escaping for creating the example schema and test-page-build action. This led to the creation of the files even if the question was answered with "no" in copier.
+
+### Removed
+
+- Removed schemasheet integration from copier-setup questions and related just recipes. Since it never worked this removal is not considered a breaking change. #46
+
+## Release [0.2.0] - 2025-02-13
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/compare/v0.2.0...v0.1.6) relative to v0.1.6 since this was the base of v0.2.0.
+
+[0.2.0]: https://github.com/dalito/linkml-project-copier/releases/tag/v0.2.0
+
+### Highlights ⚡
+
+**This release implements many of the changes that motivated the project.**
+
+- Cleaner directory structure matching the expectations on mkdocs/python-projects.
+  - `docs` is now the permanent storage for docs.
+  - `docs/elements` is the new directory for markdown files generated from the schema.
+  - `docs/templates-linkml` contains the jinja-templates for customizing the generated schema documentation.
+  - `tests/data`-folder is now the primary source of example data (was `src/data`)
+- Easier customization of mkdocs documentation: Thanks to the above directory changes, the guidelines from mkdocs on [customizing the theme/js/css](https://www.mkdocs.org/user-guide/customizing-your-theme/) are now directly applicable for projects generated from the template.
+- `project/*` all code in this folder is now generated from the schema and no longer included in the template.
+- Improved example project (more examples, better tests that use [pytest](https://pytest.org))
+- If the example project or if certain GitHub actions should be created or not, can be selected via copier setup questions.
+- Several of the changes result in combination in a **low risk of conflicts when updating the underlying template** in existing projects (for future updates after 0.2.0).
+- Support `just` as the only command runner. The support for `make` was removed to simplify maintenance.
+
+Most changes were made in one PR (#31) followed by fixups in #42 and #44.
+
+### Removed
+
+- support for make as alternative command runner
+
+### Breaking
+
+- New directory layout for docs and example/test data compared to 0.1.x series (see above)
+
+## Release [0.1.7] - 2025-02-13
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/compare/v0.1.7...v0.1.6)
+
+[0.1.7]: https://github.com/dalito/linkml-project-copier/releases/tag/v0.1.7
+
+### Fixed
+
+- Testing of valid & invalid data as part of `just test` recipe. #41
+
+## Release [0.1.6] - 2025-02-12
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/compare/v0.1.6...v0.1.5)
+
+[0.1.6]: https://github.com/dalito/linkml-project-copier/releases/tag/v0.1.6
+
+### Added
+
+- Add .editorconfig to template & project. #29
+
+### Changed
+
+- Give gh-pages bot a name/email for a better git log. #28
+
+### Fixed
+
+- Fix clean recipe. #35
+
+## Release [0.1.5] - 2025-02-08
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/compare/v0.1.5...v0.1.4)
+
+[0.1.5]: https://github.com/dalito/linkml-project-copier/releases/tag/v0.1.5
+
+### Fixes
+
+- deploy-docs action was failing because credentials were removed directly after checkout although they were still needed later.
+
+## Release [0.1.4] - 2025-02-08
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/compare/v0.1.4...v0.1.3)
+
+[0.1.4]: https://github.com/dalito/linkml-project-copier/releases/tag/v0.1.4
+
+### Fixes
+
+- install cmd in docs-building actions. #26
+
+## Release [0.1.3] - 2025-02-08
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/compare/v0.1.3...v0.1.2)
+
+[0.1.3]: https://github.com/dalito/linkml-project-copier/releases/tag/v0.1.3
+
+### Fixes
+
+- clean command should not remove README and init.py. #22
+
+## Release [0.1.2] - 2025-02-06
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/compare/v0.1.2...v0.1.1)
+
+[0.1.2]: https://github.com/dalito/linkml-project-copier/releases/tag/v0.1.2
+
+### Added
+
+- copier validation for main_schema_class name. #21
+
+## Release [0.1.1] - 2025-02-06
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/compare/v0.1.1...v0.1.0)
+
+[0.1.1]: https://github.com/dalito/linkml-project-copier/releases/tag/v0.1.1
+
+### Added
+
+* Add command groups to justfile by @dalito in #16
+* Add dependabot for action-updates. #14
+
+### Changed
+
+* Improve updating by adding more files/dirs for copier to skip #11
+* Update actions. #14
+
+## Release [0.1.0] - 2025-01-19
+
+[Full changelog](https://github.com/dalito/linkml-project-copier/commits/v0.1.0)
+
+[0.1.0]: https://github.com/dalito/linkml-project-copier/releases/tag/v0.1.0
+
+**First release of a new [copier](https://copier.readthedocs.io/en/stable/)-based [LinkML](https://linkml.io/linkml)-project template.**
+
+- This and later 0.1.x releases are compatible with [linkml-project-cookiecutter](https://github.com/linkml/linkml-project-cookiecutter/) except that they use copier instead of cruft/cookiecutter as scaffolding tool.  
+- This release generates the same project as linkml-project-cookiecutter (commit [1094cf2](https://github.com/linkml/linkml-project-cookiecutter/commit/1094cf2ce542028ab0017eaa059dd49cdde81fb5), date 2025-01-10).
+
+### Changed
+
+vs. linkml-project-cookiecutter:
+
+- Switch from cruft/cookiecutter to copier. #3
+- Replace hooks by copier features and improve updates. #5
+- [just](https://github.com/casey/just) is the primary command runner instead of make.
+
+### Breaking
+
+vs. linkml-project-cookiecutter:
+
+- dot-env-standard compliant formatting of the configuration file (`config.public.mk`). This breaks Makefile-compatibility. See the notes in the file to restore make-conformity.