feat(layouts): refactor shared template code and added top navigation bar

There is now no more duplicated layout code (eg. header and footer) between the CMS and WWW codebases; those shared components now live in `views/common/`. This does mean they're coded in EJS and are rendered by Node instead of Angular, which I'm not thrilled about, but for the time being it's the best solution. The good news is that the mobile view especially looks a lot cleaner now, and is more user-friendly thanks to the sticky top navigation bar to help the user get around the site.
chore(git): ignore a file in preparation for release

For some reason git-changelog generates two changelog files instead of one. I'm going to auto-ignore the minimal version for now because I'm not sure what value it adds. Eventually, I think I'd like the minimal version to auto-update README.md, but I don't think that would work well in its current state.
chore(release): release v0.2.0

Although there isn't a ton of new functionality, I figured the layout refactor and added navigation bar change both the developer and user experiences enough to merit a release.