A few minor cleanups:
- Removing the SDK markdown docs from git tracking. They're already
tracked in the SDK directories, we don't need to do that twice
- Cleaning up the builds, as only Linux needs to build out the SDK docs
at this time
- Fixing build-docs.sh to build the SDK docs with Linux (so we get
proper version numbers). Means we have to build Linux with SYNC_SDK=TRUE
on the server to pull in the SDK docs (otherwise they will all be
empty).
Tested locally and everything seems to work just fine. Will see what
happens when it goes live, but I figured I'd ask for @harshavardhana 's
thoughts since they know more about the build server script process than
I do.
This commit also generally cleans up the Installation docs and uses /includes/<platform>/steps-*.rst as a pattern for storing platform-specific tutorials within a single root URL.
Finally, due to API rate limits, this commit adds some Makefile magic to allow skipping of sync'ing dependencies. Pass `make BUILD_DEPENDENCIES=FALSE <platform>` to skip building any deps and use what is already in the branch.
