add Web platform landing page and PWA setup instructions

[nschimme]

• Create docs/web.md as a landing page for MMapper Web matching desktop platforms.
• Provide direct link to launch MMapper Web and a collapsible Web Beta section.
• Add PWA installation instructions for iOS (Safari) and Android (Chrome).
• Update homepage (docs/index.md) Web platform link to point to /web.html.

Summary by Sourcery

Add a dedicated Web platform landing page and guide users through launching and installing MMapper as a PWA.

New Features:

• Add a dedicated MMapper Web landing page with a direct launch link, PWA installation guidance, mobile keyboard recommendations, and access to beta builds.

Enhancements:

• Improve the site script with touch-device styling and platform-aware highlighting for PWA instructions.

Documentation:

• Update the homepage Web platform link to use the new Web landing page.

[sourcery-ai]

Reviewer's Guide

The PR introduces a dedicated Web landing page at /web.html, providing a direct launch link, PWA installation instructions, mobile keyboard guidance, and access to beta builds. It also updates the homepage link and extends the shared site JavaScript with touch and mobile-platform detection to emphasize relevant guidance.

File-Level Changes

Change	Details	Files
Adds a dedicated Web platform landing page with launch access, PWA guidance, mobile keyboard guidance, and beta-build discovery.	Creates the Web landing page and links it to the production demo. Documents iOS Safari and Android Chrome PWA installation steps. Adds a collapsible section for beta/development builds and a touch-device keyboard notice. Updates the homepage Web platform link to the new landing page.	docs/web.md docs/index.md
Consolidates site JavaScript and adds device-aware page enhancements.	Renames the loaded script to site.js while retaining existing site behavior. Highlights the keyboard notice on touch devices. Detects iOS and Android devices, reorders the iOS PWA instructions on iOS, and highlights the relevant platform section.	docs/_layouts/default.html docs/assets/js/download-highlight.js docs/assets/js/site.js

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.27%. Comparing base (b4d8d58) to head (6533c69).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #558   +/-   ##
=======================================
  Coverage   27.27%   27.27%           
=======================================
  Files         559      559           
  Lines       45912    45912           
  Branches     4879     4879           
=======================================
  Hits        12522    12522           
  Misses      33390    33390           

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