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/color_data.ts

@@ -0,0 +1,70 @@
+import _ from "lodash";
+
+export let unused_colors: string[];
+
+// These colors are used now for streams.
+const stream_colors = [
+    "#76ce90",
+    "#fae589",
+    "#a6c7e5",
+    "#e79ab5",
+    "#bfd56f",
+    "#f4ae55",
+    "#b0a5fd",
+    "#addfe5",
+    "#f5ce6e",
+    "#c2726a",
+    "#94c849",
+    "#bd86e5",
+    "#ee7e4a",
+    "#a6dcbf",
+    "#95a5fd",
+    "#53a063",
+    "#9987e1",
+    "#e4523d",
+    "#c2c2c2",
+    "#4f8de4",
+    "#c6a8ad",
+    "#e7cc4d",
+    "#c8bebf",
+    "#a47462",
+];
+
+// Shuffle our colors on page load to prevent
+// bias toward "early" colors.
+export const colors = _.shuffle(stream_colors);
+
+export function reset(): void {
+    unused_colors = colors.slice();
+}
+
+reset();
+
+export function claim_color(color: string): void {
+    const i = unused_colors.indexOf(color);
+
+    if (i < 0) {
+        return;
+    }
+
+    unused_colors.splice(i, 1);
+
+    if (unused_colors.length === 0) {
+        reset();
+    }
+}
+
+export function claim_colors(subs: {color: string}[]): void {
+    const colors = new Set(subs.map((sub) => sub.color));
+    for (const color of colors) {
+        claim_color(color);
+    }
+}
+
+export function pick_color(): string {
+    const color = unused_colors[0];
+
+    claim_color(color);
+
+    return color;
+}