Add AI documentation skills

.ai/skills/mkdocs/references/upstream/mkdocs-material-9.7.1-docs/insiders/upgrade.md

@@ -0,0 +1,79 @@
+# How to upgrade
+
+When upgrading Insiders, you should always check the version of Material for
+MkDocs which makes up the first part of the version qualifier, e.g., Insiders
+`4.x.x` is currently based on `9.x.x`:
+
+```
+9.x.x-insiders-4.x.x
+```
+
+If the major version increased, it's a good idea to consult the [upgrade
+guide] and go through the steps to ensure your configuration is up to date and
+all necessary changes have been made. 
+
+  [upgrade guide]: ../upgrade.md
+  [list of tags]: https://github.com/squidfunk/mkdocs-material-insiders/tags
+
+Depending on how you installed and what you want to upgrade to you
+need to run different commands:
+
+=== "pip upgrade to release"
+
+    If you installed Insiders via `pip` and you want to upgrade to a
+    specific release, pick the tag from the [list of tags] and replace 
+    the tag at the end of the URL of the command given below:
+
+    ```
+    pip install --upgrade git+https://${GH_TOKEN}@github.com/squidfunk/mkdocs-material-insiders.git@9.4.2-insiders-4.42.0
+    ```
+
+=== "pip upgrade to latest development"
+
+    If you installed Insiders via `pip` and want to upgrade to the
+    latest development version, run:
+
+    ```
+    pip install --upgrade --force-reinstall git+https://${GH_TOKEN}@github.com/squidfunk/mkdocs-material-insiders.git
+    ```
+
+    The `--force-reinstall` option serves to make sure `pip` does, in fact,
+    install the latest development version, instead of deciding that  nothing
+    is to be done based on the version numbers.
+    ```
+
+=== "git upgrade"
+
+    If you installed Insiders via `git`, you will first need to check
+    out the version you want to install into your workspace. After
+    this is done, you can run `pip` to install that version.
+
+    First, make sure that your local clone is up-to-date with the
+    upstream repository by running `git pull`.
+
+    You can look up the tags using `git tag --sort -refname` or you
+    can consult the [list of tags]. Then, checkout the tag you want to
+    use by replacing the one given in the command below (twice)and running 
+    it from your workspace[^detached]:
+      
+      [^detached]:
+        The `--detach` argument serves to tell `git` that you are ok to
+        have your workspace in the [detached head] state, which is
+        perfectly fine to have here.
+        
+      [detached head]: https://www.git-tower.com/learn/git/faq/detached-head-when-checkout-commit/
+
+    ``` 
+    cd mkdocs-material 
+    git checkout --detach tags/9.4.2-insiders-4.42.0 
+    ```
+
+    Now, change back to the parent directory in which your Git
+    repository lives and run `pip`:
+
+    ```
+    cd .. 
+    pip install -e mkdocs-material
+    ```
+
+