* update go text, include text/display
* [feature] Set instance langs, show post lang on frontend
* go fmt
* WebGet
* set language for whole article, don't use FA icon
* mention instance languages + other optional config vars
* little tweak
* put languages in config properly
* warn log language parse
* change some naming around
* tidy up validate a bit
* lint
* rename LanguageTmpl in template
This tries to revamp/restructure the installation guide. It's renamed to
"Getting Started" as it now contains a few more things than just the
installation, especially the deployment considerations which we didn't
use to spell out as much ahead of time.
Installation is now a section with the guides on their own. I've removed
a bit of redundancy like the user creation. I also removed the rogue
reverse proxy section in the Docker guide and lifted that into the
reverse proxy section.