web: Move web app to ‘web’ directory.

Ever since we started bundling the app with webpack, there’s been less
and less overlap between our ‘static’ directory (files belonging to
the frontend app) and Django’s interpretation of the ‘static’
directory (files served directly to the web).

Split the app out to its own ‘web’ directory outside of ‘static’, and
remove all the custom collectstatic --ignore rules.  This makes it
much clearer what’s actually being served to the web, and what’s being
bundled by webpack.  It also shrinks the release tarball by 3%.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

web/src/list_util.ts

@@ -0,0 +1,19 @@
+import $ from "jquery";
+
+const list_selectors = ["#stream_filters", "#global_filters", "#user_presences"];
+
+export function inside_list(e: JQuery.KeyDownEvent | JQuery.KeyPressEvent): boolean {
+    const $target = $(e.target);
+    const in_list = $target.closest(list_selectors.join(", ")).length > 0;
+    return in_list;
+}
+
+export function go_down(e: JQuery.KeyDownEvent | JQuery.KeyPressEvent): void {
+    const $target = $(e.target);
+    $target.closest("li").next().find("a").trigger("focus");
+}
+
+export function go_up(e: JQuery.KeyDownEvent | JQuery.KeyPressEvent): void {
+    const $target = $(e.target);
+    $target.closest("li").prev().find("a").trigger("focus");
+}