Add mkdocs-redirects, use it to fix four oh four

mkdocs.yml

@@ -156,6 +156,9 @@ nav:
 plugins:
   - awesome-pages
   - search
+  - redirects:
+      redirect_maps:
+        "get-involved/support/index.md": intro/support.md
 
 repo_name: coop-cloud/docs.coopcloud.tech
 repo_url: https://git.coopcloud.tech/coop-cloud/docs.coopcloud.tech/

requirements.txt

@@ -6,6 +6,7 @@ mkdocs-material-extensions~=1.3.1
 mkdocs-awesome-pages-plugin==2.9.2
 pygments~=2.16
 pymdown-extensions~=10.2
+mkdocs-redirects==1.2.2
 
 # Requirements for plugins
 babel~=2.10