refactor: ♻️ use new copier var names

Author: martonvago

template/CONTRIBUTING.md.jinja

@@ -3,8 +3,8 @@
 ## Issues and bugs :bug:
 
 The easiest way to contribute is to report issues or bugs that you might
-find while using `{{ package_name }}`. You can do this by creating a
-[new](https://github.com/{{ package_github_repo }}/issues/new/choose)
+find while using `{{ github_repo }}`. You can do this by creating a
+[new](https://github.com/{{ github_repo_spec }}/issues/new/choose)
 issue on our GitHub repository.
 
 ## Adding or modifying content :pencil2:
@@ -16,7 +16,7 @@ details on how we work and develop. It is a regularly evolving document,
 so is at various states of completion.
 {%- endif %}
 
-To contribute to `{{ package_name }}`, you first need to install
+To contribute to `{{ github_repo }}`, you first need to install
 [uv](https://docs.astral.sh/uv/) and
 [justfile](https://just.systems/man/en/packages.html). We use uv and
 justfile to manage our project, such as to run checks and test the

template/_metadata.yml.jinja

@@ -1,3 +1,3 @@
 gh:
-  repo: {{ package_name }}
+  repo: {{ github_repo }}
   org: {{ github_user }}