Orbit documentation: docs, wiki and FAQ pages

docs/branding.md

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+# Branding & themes
+
+Everything that ties Orbit to a particular network or brand lives in
+[`config.json`](/docs/config/) under `branding` and `defaults` — no code changes, no rebuild.
+
+## Rebrand
+
+```json
+{
+  "branding": {
+    "name": "ExampleChat",
+    "icon": "https://example.org/logo.svg",
+    "url": "https://example.org",
+    "tagline": "Chat with",
+    "taglineEm": "everyone.",
+    "subtitle": "Public rooms, private messages, no signup required."
+  }
+}
+```
+
+This changes the connect screen, the console title, the network icon, and the CTCP VERSION/SOURCE
+replies the client sends.
+
+## Themes
+
+Orbit ships four themes:
+
+- **light** — clean, default.
+- **dark** — easy on the eyes.
+- **yomirc** — a retro mIRC / Windows-95 skin (silver chrome, fixed-width log lines).
+- **yomirc-dark** — the retro skin in a dark palette.
+
+Set the default for new users:
+
+```json
+{ "defaults": { "theme": "dark" } }
+```
+
+Users can switch any time in **Settings → Appearance**. See the [Themes wiki page](/wiki/themes/).
+
+## Feature flags
+
+Hide whole features per deployment:
+
+```json
+{ "features": { "push": true, "imageUpload": true, "register": false } }
+```
+
+- `push` — the Web Push notifications row.
+- `imageUpload` — the composer image button + paste/drag upload.
+- `register` — the "create an account" tab.