Docs: Fix ci check error

- Ignore document build directory
- Add docs l10n files in MANIFEST.in
- docs: Remove doctree files

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

.gitignore

@@ -9,11 +9,12 @@ __pycache__
 .idea
 .tox
 .venv
-_build
 ci/*.matrix.gen.yml
-docs/_build
+docs/_build/
+*.mo
 aqtinstall.log
 Qt/
 .gravitybee
 .eggs
 qtaccount.ini
+.pytest_cache

MANIFEST.in

@@ -9,6 +9,8 @@ recursive-include docs *.bat
 recursive-include docs *.py
 recursive-include docs *.rst
 recursive-include docs Makefile
+recursive-include docs *.po
+recursive-include docs *.pot
 recursive-include tests *.html
 recursive-include tests *.ini
 recursive-include tests *.json
@@ -18,4 +20,3 @@ prune .github
 exclude .gitignore
 exclude .readthedocs.yml
 exclude azure-pipelines.yml
-