Fleshed out aliases section, loading the "redirect" keyword so that it's easier to find. Specifically added a "how aliases work" section.
Added Discourse to comments section.
Fleshed out themes/customizing, because it seems to be the source of a lot of questions on the forum.
* Add meta author, description and generator tags
* Add Hugo version beside the logo and in the footer
* Suggest the user to run `go get -u -v` to update dependencies
* Requires Go 1.3+ rather than Go 1.1+
* Improve rendering/formatting in some places
* Add trailing slash to URLs where appropriate
* GitHub redirects all http requests to https, update accordingly
- Correct some typos
- Add backticks and commas where necessary
- Use fenced code blocks specifying "bash" as the language
to avoid weird highlighting
- Place commas outside of quotation marks surroundingn codes
to avoid possible confusion
- Suggest users to use the discussion forum rather than the
mailing list
