pelican-bootstrap3: clickable sidebar headers

[josch]

Hi,

would you appreciate a pull request that makes the headers of the sidebar links to the respective static pages? For example let categories link to categories.html and let the recent posts link to archive.html. This should probably also be configurable?

What do you think?

[beleriandcrises]

I'm not a dev, but I like the idea, makes a lot of sense.