Consider adding searchable, wiki-like Troubleshooting page

[BinToss]

Currently problems and solutions are scattered among three or more locations: manual upgrade README, halospv3/spv3-known-issues/issues, halospv3/spv3-known-issues/wiki, and the #self-help channel in the Discord.

Write up all the issue and solutions as individual pages, tag them with keywords/phrases for SEO, and share them. Where applicable, their preview embeds will show the issue's key phrase as the Page's name along with a short summary of the issue. However, they should not be written as blog posts. That would make the blog feed messy. Instead, a Troubleshooting button should be added to the site's navbar which then presents a wiki-like interface for browsing and searching issues.

[BinToss]

This will probably be a two-parter.

• [ ] Add Troubleshooting page; Add one page per issue (solution(s) are added to the respective pages as sections/headers). Troubleshooting page should be accessible from the navbar. It should have a page index.
• [ ] may require an additional Jekyll plugin for search functionality. Allow searching by page title, key phrase, keyword(s). Needs search syntax!