Extending docs - added blog entry and improved design

[marcusrein]

Added new design elements and improved Blog section.

Included a blog entry announcing alpha release.

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[Copilot]

Pull Request Overview

This PR extends the documentation by incorporating new design elements and adding a blog entry to announce the Hypergraph alpha release. It updates the site's styling, enhances documentation with Knowledge Graph SDK content, and revises the blog structure by adding new tags and author entries while removing legacy blog posts.

• Updated custom CSS introduces a fresh brand palette and improved dark mode styling.
• Documentation files (key-features.md and core-concepts.md) now include detailed information on the Knowledge Graph SDK and the GRC-20 standard.
• The blog section is updated with a new alpha release post, revised tags, and new author profiles, while older blog posts are removed.

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/src/css/custom.css	Implements a new brand color scheme, dark mode overrides, and additional global styling enhancements.
docs/docusaurus.config.js	Adjusts blog sidebar settings and enforces dark mode across the site.
docs/docs/key-features.md	Adds a new Knowledge Graph SDK section and updates descriptive text.
docs/docs/core-concepts.md	Integrates extensive updates on Knowledge Graphs and GRC-20, while removing deprecated Knowledge Graph content.
docs/blog/tags.yml	Introduces new tags to categorize the alpha release and related content.
docs/blog/authors.yml	Adds new author entries with updated social links for Pablo and Nik.
docs/blog/2025-06-11-hypergraph-alpha-released.md	Presents a new blog post announcing the Hypergraph alpha release.
Multiple blog files (2021-08-26-welcome, 2021-08-01-mdx-blog-post, 2019-05-29-long-blog-post, 2019-05-28-first-blog-post)	Removes outdated or redundant blog posts.
docs/README.md	Cleans up command syntax formatting for consistency and clarity.

Comments suppressed due to low confidence (3)

docs/docusaurus.config.js:52

• Confirm that the value 'ALL' is supported for blogSidebarCount in the current Docusaurus version; if a numeric value is expected, consider updating accordingly.

blogSidebarCount: 'ALL'

docs/blog/authors.yml:15

• Consider providing a valid URL for the 'nik' author entry or remove the commented-out placeholder if it is not needed.

# url:

docs/blog/2021-08-26-welcome/index.md:1

• [nitpick] Ensure that the removal of this older blog post is intentional and aligns with your content strategy for the site.

Entire file removal

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@marcusrein's commit is now being deployed.

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[marcusrein]

Build and linting errors fixed. PR merged.