Replace default `asides/twitter.html`.

Fix `site.twitter_follow_button` text option the right way by
creating a `custom/asides/twitter.html` instead of overwriting
the default one which gets reset after a merge with octopress/origin.
Instead, created the `custom/asides/twitter.html`,
Add my first post.
Link to wife's website.
Stub about page, linked to from asides/about.