[dredmorbius]

I've looked into this somewhat though I've not implemented any solutions.

There are some standalone site-search tools including lunr.js, among others (lunr is what I remember finding when I researched this a few years ago, there are now several other options).

E.g., <https://victoria.dev/blog/add-search-to-hugo-static-sites-wi...>

Email forms can be implemented entirely as HTML forms, though you might want to include some anti-spam / anti-abuse options. Another option is a simple mailto link:

  <a href="mailto:[e-mail]">Email us!</a>