Add advanced topics documentation (bazelbuild#18)

Update bazel-skylib dependency to 0.8.0 (bazelbuild#177)

Overhaul workspace file to use only a single setup function (bazelbui…

…ld#129)

Bump version number to prepare for 0.1.4 release. (bazelbuild#67)

Update docs to prepare for 0.1.3 release. (bazelbuild#43)

Update rules_sass dependency. Update docs to prepare for 0.1.2 releas…

…e. (bazelbuild#41)

Re-allow macro-only bzl, fix runtime failure. (bazelbuild#37)

This patch:
 - fixes the use of undeclared attributes introduced by b14ff10.
 - allows doc for macro-only bzl to be emitted.

Replace HOST_CFG with "host". (bazelbuild#34)

Markdown format updates (bazelbuild#8)

- Fix syntax error in markdown template
- Only convert text to markdown if html format is being used
- Add a few blank lines for markdown
- Update the overview section so it uses markdown instead of html

Remove py_api_version proto option to fix build failure.

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