docs: modernize rclone.org site design

- replace Bootstrap/jQuery with purpose-built CSS and JS
- remove backend icons from navbar and content pages
- replace remaining FontAwesome icons with inline SVGs, remove FontAwesome
- modernize CSS styling for menus, typography, cards, tables, and code blocks
- add copy-to-clipboard buttons on code blocks using SVG icon
- move TOC to left sidebar with responsive overlay drawer
- add sticky header, top scrollbar and first column for wide tables
- add left/right arrow buttons to scrollable tables
- hide homepage logo on mobile
- make wide menus with filter for Commands and Storage Systems
- add dark mode support based on browser preference
- fix CSS/JS cache busting to use build time

docs/content/internxt.md

@@ -4,7 +4,7 @@ description: "Rclone docs for Internxt Drive"
 versionIntroduced: "v1.73"
 ---
 
-# {{< icon "fas fa-cloud" >}} Internxt Drive
+# Internxt Drive
 
 [Internxt Drive](https://internxt.com) is a zero-knowledge encrypted cloud storage service.