Fix #459 (comment) by adding docs/docs/_build/ to gitignore

.gitignore

@@ -71,9 +71,7 @@ instance/
 
 # Sphinx documentation
 docs/_build/
-docs/_build/doctest
-docs/_build/doctrees
-docs/_build/linkcheck
+docs/docs/_build/
 
 # PyBuilder
 target/
@@ -110,198 +108,3 @@ ENV/
 
 # mypy
 .mypy_cache/
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-docs/docs/_build/linkcheck/output.json
-docs/docs/_build/linkcheck/output.txt
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