A [user on
Mastodon](https://hachyderm.io/@thisismissem/112570163970900508) noted
that the instructions for connecting a container deploy to MC were
missing the alias in the `mc alias set` command.
This fixes that.
Not staged.
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.
