[chore] Refactor HTML templates and CSS (#2480)

* [chore] Refactor HTML templates and CSS

* eslint

* ignore "Local"

* rss tests

* fiddle with OG just a tiny bit

* dick around with polls a bit more so SR stops saying "clickable"

* remove break

* oh lord

* don't lazy load avatar

* fix ogmeta tests

* clean up some cruft

* catch remaining calls to c.HTML

* fix error rendering + stack overflow in tag

* allow templating attributes

* fix indent

* set aria-hidden on status complementary content, since it's already present in the label anyway

* tidy up templating calls a little

* try to make styling a bit more consistent + readable

* fix up some remaining CSS issues

* fix up reports

internal/api/util/errorhandling.go

@@ -50,10 +50,10 @@ func NotFoundHandler(c *gin.Context, instanceGet func(ctx context.Context) (*api
 			panic(err)
 		}
 
-		c.HTML(http.StatusNotFound, "404.tmpl", gin.H{
-			"instance":  instance,
-			"requestID": gtscontext.RequestID(ctx),
-		})
+		template404Page(c,
+			instance,
+			gtscontext.RequestID(ctx),
+		)
 	default:
 		JSON(c, http.StatusNotFound, map[string]string{
 			"error": errWithCode.Safe(),
@@ -73,12 +73,12 @@ func genericErrorHandler(c *gin.Context, instanceGet func(ctx context.Context) (
 			panic(err)
 		}
 
-		c.HTML(errWithCode.Code(), "error.tmpl", gin.H{
-			"instance":  instance,
-			"code":      errWithCode.Code(),
-			"error":     errWithCode.Safe(),
-			"requestID": gtscontext.RequestID(ctx),
-		})
+		templateErrorPage(c,
+			instance,
+			errWithCode.Code(),
+			errWithCode.Safe(),
+			gtscontext.RequestID(ctx),
+		)
 	default:
 		JSON(c, errWithCode.Code(), map[string]string{
 			"error": errWithCode.Safe(),