Home page styles in _pages.scss; retire widget home.html (#22)

Companion to sow-nodebb-plugin-pages PR #2. Adds the home blocks to _pages.scss (art hero, two-server status strip with unknown/online/offline dot states, pitch prose, four-up steps grid) and deletes the superseded paste-into-widget home.html + preview. Docs/comments updated to point at the plugin template. Merge together with the plugin PR.

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Reviewed-on: #22
Reviewed-by: xtul <mpiasecki720@protonmail.com>
Co-authored-by: vickydotbat <vickydotbat@tutamail.com>
Co-committed-by: vickydotbat <vickydotbat@tutamail.com>

custom_pages/westgate-pages/topbar-custom.js

@@ -5,8 +5,9 @@
    (In the live theme this can instead live in the theme's client-side bundle.)
 
    WHY THIS FILE EXISTS
-   - The two static pages (home.html / join-the-team.html) need NO JavaScript;
-     they are pure HTML/CSS (the only inline bit is an <img onerror> fallback).
+   - The static page (join-the-team.html) needs NO JavaScript; it is pure
+     HTML/CSS (the only inline bit is an <img onerror> fallback). Home lives
+     in the westgate-pages plugin now (templates/home.tpl).
    - The TOP BAR needs this small controller for: Forums mega-menu, inline
      search, the mobile burger/drawer, and the drawer's Forums accordion.