Fix top-level .gitignore file to track (not ignore) files in docs/build

[pavoljuhas]

While most build directories are generated and should be ignored,
docs/build has legitimate sources and should be tracked.

Also ignore the out/ directory only at the repository root.

[mhucka]

Oh, wow, good catch. I wonder how long docs/build has been ignored :-)

[mhucka]

@pavoljuhas is it possible that cirq-web/cirq_ts/build/ is another case that shouldn't be ignored? Never mind – I see now that it's a generated directory and not something in the git repo.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.14%. Comparing base (c34989b) to head (521e434).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7216   +/-   ##
=======================================
  Coverage   98.14%   98.14%           
=======================================
  Files        1104     1104           
  Lines       96352    96352           
=======================================
  Hits        94569    94569           
  Misses       1783     1783           

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[pavoljuhas]

Oh, wow, good catch. I wonder how long docs/build has been ignored :-)

It was not quite ignored, but in a recent change I had git add file complaining the file is matched by some ignore pattern. This also helps to discover any clutter files created in docs/build.

[pavoljuhas]

Verified this is the only misignored directory by getting empty output from

git ls-files | sed "s,[^/]\+$,do-not-ignore-me," | uniq | git check-ignore --stdin

The output at c34989b is

docs/build/do-not-ignore-me