Remove htmx (#37224)

Close #35059

Slightly improved the "fetch action" framework and started adding tests for it.

---------

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: silverwind <me@silverwind.io>

web_src/css/repo.css

@@ -187,10 +187,6 @@ td .commit-summary {
   padding: 0 !important;
 }
 
-.repo-editor-menu {
-  min-height: auto !important;
-}
-
 .repo-editor-header {
   display: flex;
   margin: 1rem 0;