* docs: add common issues to the troubleshooting hub and fill out the area tiles
Lead the Troubleshooting hub with a table of the issues support sees most
often, and give each area tile the sections a reader actually needs,
including a new Reverse Proxy tile.
Add the case where a teammate signs in and gets their own account to the
pending approval page, with sign-in domains as the fix.
List the headings rendered by the troubleshooting components in "On this
page", which previously only showed Markdown headings.
* docs: address review on account-access and support wording
- Personal-address teammate: drop the direct-invite advice, since a user
who already has an account can't be invited; point to the work address
or NetBird Support instead.
- Support audience: say NetBird Support is mainly for paying Cloud
customers and commercial-license deployments, consistently across the
troubleshooting hub, the support page, and the report-bug page.
* docs: align the troubleshooting hub table and rework Still stuck
- Common issues table: fixed 50/50 columns, with the Start here column
padded to line up with the right-hand area tiles at any width.
- Still stuck: match the width and side padding of the tiles, center the
title and buttons, and put a short audience note under each button.
The report hint moves to its own line above the links, with a new
Debug bundle link.