Docs: rework the README and fix the service tables

[jackspiering]

Description

Reworks the root README.

• Quick Start: adds the MagicDNS/HTTPS prerequisite, the Compose version, auth key options (ephemeral, pre-approved, reusable, expiry), a "read the service README" step, and how to open the service. The heading stays, because 41 service READMEs link to it.
• New "Update a stack", "Remove a stack" and "Get help" sections, a single "Tailscale Serve and Funnel" section, and a reworked "Documentation" section.
• Tables:
  • Names fixed (14, such as FlareSolverr, NetBox, MeTube).
  • 56 descriptions rewritten to match each service README and upstream, including the wrong ones for Recyclarr, Slink, Karakeep and Nessus.
  • File Browser and Hemmelig marked **PROJECT ARCHIVED**.
  • Paperless-ngx, Frigate, Homarr and changedetection.io moved to the fitting category.
  • Every table sorted alphabetically.
• Nessus README updated to the current Essentials terms, and File Browser README notes the archived upstream.
• Nits: star history back on api.star-history.com, ```sh fences, trailing whitespace, leftover contributors markers, license link, diagram alt text, 🍽️ in the Food & Wellness header.

Related Issues

• None.

Verification

• rumdl check --config .markdownlint.yml . (0.2.77 and 0.2.78) and git diff --check origin/main are clean.
• All 123 service directories are linked exactly once, and all TOC anchors resolve by a local slug check (not rendered on github.com).
• New external links return 200. GitHub's API reports File Browser and Hemmelig as archived. The Tailscale facts (MagicDNS/HTTPS, key options, Funnel ports, Compose 2.23.1 for inline configs) were checked against their docs.
• Not included, because they could not be confirmed: the File Browser archive date, the "since Nessus 10.11.0" version, and the File Browser known-issues list.

Checklist

• I have performed a self-review of my code and followed the templates structure.
• I have added verification that the stack works as expected.
• I have updated necessary documentation (e.g. frontpage README.md ).
• I have selected the correct label(s) for this PR.

Additional Context

From an external review of the repository (section 2). Judgement-call category moves (File Browser, Gokapi, SearXNG, Forgejo, Gitea, Vaultwarden) and the Picard image note are left for a later change. The OpenPLi guide is retitled in the guides PR.