link to the documentation on the home page

[andrewrk]

1. Go to crates.io
2. Ctrl+F "doc"
3. no results :(

[alexcrichton]

There is actually currently a link, it's just called "Getting Started" (at the bottom). Thanks for the issue though!

[andrewrk]

I think the documentation drop down that appears if you click getting started should show up on all the pages.