Update building documentation

[AlekSi]

Description

Closes #735.
Closes #1447.

Readiness checklist

• I added unit tests for new functionality or bug fixes.
• I added integration tests for new functionality or bug fixes.
• I added compatibility tests for new functionality or bug fixes.
• I made spot refactorings.
• I updated user documentation.
• I ran task all, and it passed.
• I added/updated comments for both exported and unexported top-level declarations (functions, types, etc).
• I checked comments rendering with task godocs.
• I ensured that the title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Assignee, Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[vercel]

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Name	Status	Preview	Updated
ferret-db	✅ Ready (Inspect)	Visit Preview	Dec 28, 2022 at 4:46PM (UTC)

[codecov]

Codecov Report

Merging #1713 (ba28491) into main (c50e834) will decrease coverage by 0.05%.
The diff coverage is 69.89%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1713      +/-   ##
==========================================
- Coverage   69.43%   69.37%   -0.06%     
==========================================
  Files         300      300              
  Lines       14067    14078      +11     
==========================================
  Hits         9767     9767              
- Misses       3382     3389       +7     
- Partials      918      922       +4     

Impacted Files	Coverage Δ
internal/handlers/pg/msg_getlog.go	81.44% <ø> (ø)
internal/handlers/tigris/msg_getlog.go	78.78% <ø> (ø)
internal/util/telemetry/reporter.go	6.49% <0.00%> (ø)
build/version/version.go	63.01% <63.01%> (ø)
ferretdb/ferretdb.go	85.10% <100.00%> (+0.66%)	⬆️
internal/clientconn/listener.go	75.42% <100.00%> (-1.05%)	⬇️
internal/handlers/common/msg_buildinfo.go	100.00% <100.00%> (ø)
internal/handlers/common/serverstatus.go	88.23% <100.00%> (ø)
internal/handlers/pg/msg_explain.go	58.33% <100.00%> (ø)
internal/handlers/tigris/msg_explain.go	66.12% <100.00%> (ø)
... and 8 more

Flag	Coverage Δ
integration	65.12% <52.17%> (-0.13%)	⬇️
mongodb	14.48% <45.65%> (+0.10%)	⬆️
pg	54.26% <51.08%> (-0.13%)	⬇️
tigris	39.17% <51.08%> (+0.16%)	⬆️
unit	29.28% <63.44%> (+0.13%)	⬆️

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[rumyantseva]

Asked a few questions, not a full review yet.

[rumyantseva]

Both the code and the docs look good to me. I like how we reference godoc docs to share more info about build tags etc!