[Glitch] Redesign forms, verify link ownership with rel="me"

Port SCSS changes from f4d549d300

app/javascript/flavours/glitch/styles/basics.scss

@@ -1,3 +1,10 @@
+@function hex-color($color) {
+  @if type-of($color) == 'color' {
+    $color: str-slice(ie-hex-str($color), 4);
+  }
+  @return '%23' + unquote($color)
+}
+
 body {
   font-family: 'mastodon-font-sans-serif', sans-serif;
   background: darken($ui-base-color, 8%);