Add FAQ for version downloads

[jolheiser]

This is probably the single most asked question, I'm not sure how I missed it on my first FAQ pass. 😂
This topic is covered in our CONTRIBUTING.md, however I don't think that's where people would naturally go to look for this kind of information.

If there is anything else that should be included in this pass of the FAQ, please let me know.

[mrsdizzie]

LGTM

Somewhat related to this but not blocking -- Can we use variables in the docs so that a similar page like https://docs.gitea.io/en-us/install-from-binary/ can use wget -O gitea https://dl.gitea.io/gitea/$latest_stable/gitea-$latest_stable-linux-amd64 and it would be possible to have text in the docs that reference the latest stable release without being out of date?

Would be nice if this section could also have "The current recommended release is $gitea_stable and available here" without needing to be updated.

[jolheiser]

@mrsdizzie I like that idea, however I think that's just another thing to remember to change when we have a new release and documentation is already prone to being out of date.

(Also not sure if Hugo supports that within the markdown files)
Looks like we would need to add our own custom shortcode to make this work.

[codecov-io]

Codecov Report

Merging #6742 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6742      +/-   ##
==========================================
- Coverage   40.82%   40.81%   -0.02%     
==========================================
  Files         421      421              
  Lines       57902    57902              
==========================================
- Hits        23640    23631       -9     
- Misses      31123    31133      +10     
+ Partials     3139     3138       -1

Impacted Files	Coverage Δ
models/unit.go	45.71% <0%> (-5.72%)	⬇️
modules/log/event.go	64.46% <0%> (-1.53%)	⬇️
routers/repo/view.go	41.6% <0%> (-1.01%)	⬇️

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