Add "not supported" page at /about/feature

Fixes #42

src/nitter.nim

@@ -30,6 +30,9 @@ routes:
   get "/about":
     resp renderMain(renderAbout(), request, cfg.title)
 
+  get "/about/feature":
+    resp renderMain(renderFeature(), request, cfg.title)
+
   extend preferences, ""
   extend rss, ""
   extend search, ""

src/views/about.nim

@@ -1,8 +1,14 @@
 import karax/[karaxdsl, vdom]
 import markdown
 
-let about = markdown(readFile("public/md/about.md"))
+let
+  about = markdown(readFile("public/md/about.md"))
+  feature = markdown(readFile("public/md/feature.md"))
 
 proc renderAbout*(): VNode =
   buildHtml(tdiv(class="overlay-panel")):
     verbatim about
+
+proc renderFeature*(): VNode =
+  buildHtml(tdiv(class="overlay-panel")):
+    verbatim feature