Category filtering on click

[Akamitori]

Implemented Category filtering

[zorbathut]

Pretty close!

I think this will be better off as a separate page, however. We're going to need to add category-specific stuff to it; we're better off building an actual CategoryPage thing, that contains a PostList and can also contain other things, rather than trying to roll a bunch of category-specific stuff into PostList itself.

This also means that PostList can continue to be dumb and just list the posts given to it, and it's the caller's responsibility to filter them as they see fit.

Also, the URL should end up at /category/{categoryname}.

[zorbathut]

Looks mostly good!

One bug: if you go to a category page, then click on a post, it doesn't actually bring you to the post, it just stays at the category page.

[Akamitori]

Looks mostly good!

One bug: if you go to a category page, then click on a post, it doesn't actually bring you to the post, it just stays at the category page.

Fixed via ce39f32b1fd0fa46cdc2b90e55fe068120a1bd57

[zorbathut]

Looking better! One last issue: when you changed Pages/Components/Post/Default.cshtml it looks like you reformatted it from tabs to spaces. Can you either undo that, or submit the reformat as a separate pull request?