Add small announcement on /qa/.

src/Miscellaneous/PSA.coffee

@@ -0,0 +1,9 @@
+PSA =
+  init: ->
+    return unless g.SITE.software is 'yotsuba'
+    if g.BOARD.ID is 'qa'
+      announcement = <%= html('Stay in touch with your <a href="https://www.4chan-x.net/qa_friends.html" target="_blank" rel="noopener">/qa/ friends</a>!') %>
+    return unless announcement
+    el = $.el 'div', {className: 'fcx-announcement'}, announcement
+    $.onExists doc, '.boardBanner', (banner) ->
+      $.after banner, el

src/css/style.css

@@ -2433,3 +2433,11 @@ a:only-of-type > .remove {
 .postJumper > .next {
   font-size: 120%;
 }
+
+/* PSA */
+.fcx-announcement {
+  text-align: center;
+}
+.fcx-announcement a {
+  text-decoration: underline;
+}

src/main/Main.coffee

@@ -668,6 +668,7 @@ Main =
     ['Index Navigation',          Nav]
     ['Keybinds',                  Keybinds]
     ['Banner',                    Banner]
+    ['Announcements',             PSA]
     ['Flash Features',            Flash]
     ['Reply Pruning',             ReplyPruning]
     ['Mod Contact Links',         ModContact]