Docs: Clarify Understanding the Konf by talking more about templates and less about selections.

- Fix a spelling mistake in the Navigation.
- Add a `serve` command to the Makefile.
remove an extra "is"
Merge remote-tracking branch 'origin/master' into docs-fixes

Conflicts:
	www/_includes/nav-docs.md
Merge pull request #73 from mobify/docs-fixes

Docs: Clarify Understanding the Konf by talking more about templates and...