Update index.md with Tailscale persistence instructions and subnet ro…

[spamsgood]

…uting section

Added detailed instructions on how to configure Tailscale to persist across reboots and system updates using a systemd override. Also included an optional section on how to advertise a subnet or VLAN for external access via Tailscale. The guide has been reformatted for consistency with other sections and generalized for broader use.

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Documentation/Content changes

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Other information

Summary by Sourcery

Revamp the Tailscale setup guide with step-by-step sections, persistence configuration, and subnet routing options

Documentation:

• Reformat guide into clear SSH, install, start, and DNS-fix steps
• Add instructions to disable Tailscale DNS override for reliable name resolution
• Introduce systemd override to persist Tailscale settings across reboots and updates
• Include optional subnet/VLAN advertisement steps for external network access
• Update credit attribution and license notice

[sourcery-ai]

Reviewer's Guide

This PR reorganizes the Tailscale setup guide into clear, numbered steps and consistent formatting, adds optional DNS override fixes, implements systemd overrides for persistence across reboots and updates, introduces subnet/VLAN advertisement instructions, and refreshes the credit attribution.

File-Level Changes

Change	Details	Files
Restructured installation guide into discrete steps with consistent formatting	Split content into “Step 1…Step 4” sections with “###” headings Inserted horizontal separators between major sections Refined command block presentation for clarity	docs/ugos/install/tailscale/index.md
Added optional DNS override fix	Explained UGOS DNS override issue when tailscale starts Provided commands to disable Tailscale’s DNS handling Marked the workaround as optional but recommended	docs/ugos/install/tailscale/index.md
Implemented persistence instructions via systemd override	Showed how to create /etc/systemd/system/tailscaled.service.d/override.conf Supplied override.conf contents to preserve custom flags Outlined systemctl daemon-reexec, reload, enable, and restart steps	docs/ugos/install/tailscale/index.md
Introduced subnet/VLAN advertisement section	Described how to advertise LAN subnets or VLANs Included sample tailscale up command with --advertise-routes Directed reviewers to approve routes in Tailscale admin panel	docs/ugos/install/tailscale/index.md
Updated credit attribution	Expanded original credit to include new contributor Standardized license statement under MIT	docs/ugos/install/tailscale/index.md

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[sourcery-ai]

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

Here's what I looked at during the review

• 🟡 General issues: 2 issues found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[Drauku]

Please add a blurb about testing this through an update, and the update version it was last tested on so we have verification it still works.