Adding inline example of USES_PLUGINS with Cardboard (#3779)

Author: itzg

docs/mods-and-plugins/index.md

@@ -27,6 +27,18 @@ There are optional volume paths that can be attached to supply content to be cop
 `/plugins`
 : content in this directory is synchronized into `/data/plugins` for server types that use plugins, [as described above](#mods-vs-plugins). For special cases, the source can be changed by setting `COPY_PLUGINS_SRC` and destination by setting `COPY_PLUGINS_DEST`. If using a mod-based loader, such as Forge or Fabric, but a hybrid mod like [Cardboard](https://modrinth.com/mod/cardboard), then set `USES_PLUGINS` to have the automation utilize `/plugins` mount.
 
+!!! example "Using Cardboard plugins with Fabric"
+
+    ```yaml
+        environment:
+          EULA: "TRUE"
+          TYPE: "FABRIC"
+          MODRINTH_PROJECTS: |
+            fabric-api
+            cardboard
+          USES_PLUGINS: true
+    ```
+
 `/mods`
 : content in this directory is synchronized into `/data/mods` for server types that use mods, [as described above](#mods-vs-plugins). For special cases, the source can be changed by setting `COPY_MODS_SRC` and destination by setting `COPY_MODS_DEST`.
 

docs/requirements.txt

@@ -3,5 +3,8 @@ mkdocs-autorefs == 1.4.3
 mkdocstrings[python] == 0.30.1
 mkdocs-literate-nav == 0.6.2
 mdx-gh-links == 0.4
+# need to pin for auto reload to work
+# see https://github.com/mkdocs/mkdocs/issues/4032
+click==8.2.1
 mkdocs-click == 0.9.0
 mkdocs-static-i18n == 1.3.0