feat: added following system using cookies

src/views/renderutils.nim

@@ -100,3 +100,15 @@ proc getTabClass*(query: Query; tab: QueryKind): string =
 proc getAvatarClass*(prefs: Prefs): string =
   if prefs.squareAvatars: "avatar"
   else: "avatar round"
+
+proc renderFollowButton*(user: User; prefs: Prefs; path: string): VNode =
+  let
+    isFollowing = user.username in prefs.following
+    action = if isFollowing: "/unfollow" else: "/follow"
+    text = if isFollowing: "Unfollow" else: "Follow"
+    class = if isFollowing: "follow-button unfollow" else: "follow-button"
+
+  buildHtml(form(action=action, `method`="post", class="follow-form")):
+    refererField path
+    hiddenField("user", user.username)
+    button(class=class, `type`="submit"): text text