Feature/cleanup css

A few changes to the default view:

- only download Lato Bold from Google, since that's all that is used on the page
- fix font size and margin on the `<h1>` to take into account discrepancies between browser defaults
- adjust the height of `<div class="welcome">` -- 300px is too tall -- and adjust the vertical placement, to be better centred in the browser window
- remove extraneous CSS that is never used (lists and paragraph tags)
- fix indentation to use tabs, like all other Laravel files