Initial version of sphinx documentation and...

- remove ubuntu 21.04 from CI (end of life)
- adjust matrix strategy for clang.yml
- Use lessons learned from RetroArcher on localize.yml, crowdin.yml, and locale.py
- Add end of life comments to Dockerfiles
- Adjust dependency order in Dockerfiles

.github/workflows/clang.yml

@@ -9,10 +9,6 @@ jobs:
   lint:
     name: Clang Format Lint
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false  # false to test all, true to fail entire job if any fail
-      matrix:
-        inplace: [ true, false ]  # removed ubuntu_18_04 for now
 
     steps:
     - name: Checkout
@@ -25,10 +21,10 @@ jobs:
         extensions: 'cpp,h,m,mm'
         clangFormatVersion: 13
         style: file
-        inplace: ${{ matrix.inplace }}
+        inplace: false
 
     - name: Upload Artifacts
-      if: ${{ matrix.inplace == true }}
+      if: failure()
       uses: actions/upload-artifact@v3
       with:
         name: sunshine