all: Rework page store, add a dynacache, improve partial rebuilds, and some general spring cleaning

There are some breaking changes in this commit, see #11455.

Closes #11455
Closes #11549

Fixes #10104
Fixes #10380
Fixes #10694
Fixes #11439
Fixes #11453
Fixes #11457
Fixes #11466
Fixes #11540
Fixes #11551
Fixes #11556
Fixes #11654
Fixes #11661
Fixes #11663
Fixes #11664
Fixes #11669
Fixes #11671
Fixes #11807
Fixes #11808
Fixes #11809
Fixes #11815
Fixes #11840
Fixes #11860
Fixes #11883
Fixes #7425
Fixes #7436
Fixes #7437
Fixes #7544
Fixes #7882
Fixes #8307
Fixes #8498
Fixes #8927
Fixes #9192
Fixes #9324
Fixes #9343

Author: bep

.github/workflows/test.yml

@@ -87,6 +87,12 @@ jobs:
         curl -LJO "https://github.com/sass/dart-sass/releases/download/${env:SASS_VERSION}/dart-sass-${env:SASS_VERSION}-windows-x64.zip";
         Expand-Archive -Path "dart-sass-${env:SASS_VERSION}-windows-x64.zip" -DestinationPath .;
         echo  "$env:GITHUB_WORKSPACE/dart-sass/" | Out-File -FilePath $Env:GITHUB_PATH -Encoding utf-8 -Append
+    - if: matrix.os == 'ubuntu-latest'
+      name: Install staticcheck
+      run: go install honnef.co/go/tools/cmd/staticcheck@latest
+    - if: matrix.os == 'ubuntu-latest'
+      name: Run staticcheck
+      run: staticcheck ./...
     - if: matrix.os != 'windows-latest'
       name: Check
       run: |