* [docs] Change configuration creation instructions
This changes the wording to push people towards creating their own
configuration, without copying the whole example configuration. This
makes it much easier to reconcile necessary configruation changes on
upgrades.
* [docs] Reword container version section
This changes the wording in the Version section to make it more clear
what the risks of a moving tag are. It pushes people to use an explicit
release tag instead.
* 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.