added docs/requirements.txt so rtd can fetch doc dependencies
removed HEAD, Bigdesk and segmentspy site-plugins
fixup! added docs/requirements.txt so rtd can fetch doc dependencies
fixup! added docs/requirements.txt so rtd can fetch doc dependencies
fixup! added docs/requirements.txt so rtd can fetch doc dependencies
fixup! added docs/requirements.txt so rtd can fetch doc dependencies
fixup! added docs/requirements.txt so rtd can fetch doc dependencies
fixup! added docs/requirements.txt so rtd can fetch doc dependencies
fixup! added docs/requirements.txt so rtd can fetch doc dependencies
added sql syntax highlighting to docs

Conflicts:
	docs/sql/aggregation.txt
	docs/sql/reference/select.txt
	docs/sql/reference/update.txt
Merge pull request #746 from crate/hau/syntaxHighlighting2

added sql syntax highlighting to docs
removed additional download location and increased theme version for local sphinx build
Merge branch 'b/read-the-docs' of github.com:crate/crate into b/read-the-docs

Conflicts:
	CHANGES.txt
fixup! added docs/requirements.txt so rtd can fetch doc dependencies