Make Section Headings Linkable

[jtfairbank]

First off, thanks soooo much for all the hard work on Handlebars. I hope you're proud that you've saved so many people so much time, and are used in a ton of great apps.

My Problem / Use Case

I want to link to specific parts of the Handlebars documentation within each page. Examples:

• Slack my co-worker the section of the docs he needs (maybe a specific block helper function).
• Create an issue with some new or previously unknown Handlebars functionality that I'd like to improve the codebase with.
• Include references to the Handlebars docs within our own docs (code review checklists, Readme's and codebase tutorials, comments, etc).

Right now the best options are:

• Inspect the html and snag the heading's id, then manually add an anchor to the end of the url (http://handlebarsjs.com/block_helpers.html#basic-blocks).
• Link to the page and also include the heading or some text to search for.

Suggested Fix

Just put an anchor link in the <h2> tags, or vice versa. The output html for the Block Helper Page would look like:

<h2 id="basic-blocks">
    <a href="#basic-blocks">Basic Blocks</a>
</h2>

El Fin

Sorry I can't help with a pull request- I don't know ruby. :/ Happy to buy you a beer via paypal, git tip, etc if you implement this request!

Happy coding,
Taylor