Standardize and materialize 500, 404, and 403 pages

In this PR:

• Removed bootstrap CSS
• Added inline Material Design Lite CSS
• Added a single CSS file for ease of editing, which can be minified and copy+pasted into the inline styles
• Updated CSS (changed old red to new red, removed extraneous CSS)
• Added very basic tab-selection function
• Added sad bucky
• Moved alternate links into tabs (uw-system links are shown by default and uw-madison links can be seen by clicking the uw-madison tab)
• Added npm to serve locally for dev purposes
• Updated readme

Note: Previously, bootstrap CSS was being brought in via CDN and other styles were added via <style> tags. Using the latter approach for MDL looks pretty gory in the HTML. Can I use a CDN for that like we were doing for bootstrap or would that be considered a dependency?

Screenshots

Notify: @timothy-vertein @levett @michael-adas @andrew-petro

Added 1 commit:

• 2213ba02 - Un-ignore package.json and sad bucky image

As long as the page renders in a usable way even if the remote resources don't load, I think using a CDN would be OK.

Added 1 commit:

• ef15fbc4 - Add CDN for material lite and add some fallback CSS

@michael-adas: I switched it over to the CDN and added some fallback CSS. It's not as pretty but I think it's readable.

Added 1 commit:

• 57853787 - Adjust alignment of tabs

Does sad bucky show up for only Madison users or will it show for other campuses, such as UW-Milwaukee?

I'm cool if bucky is showing up for everyone, just wanted to make sure that we did that on purpose.

@timothy-vertein: Right now it'll show for everyone. I went that route because we are also currently displaying sad bucky in the portal marketplace for everyone.

FYI @levett: I need to be given the master role in the myuw group in order to merge. Thanks!

And from here on out, @dwitter2 now has the role, of master.

Status changed to merged

mentioned in commit 104f3bde