Update website

[jeffsieu]

Resolves #19 #10

This commit contains the following changes:

• Add home redirection on menu bar logo
• Update copyright year to 2018
• Fix hovering over "Solid Modeling" causing container to resize
• Fix "necassary" typo Join Us!
• Fix minor typo in Free & Open section
• Wrap sections with containers for better large-screen support
• Add mailing list subscriptions
• Make menu collapse for small screens
• Beautify and standardize all non-library javascript files to use 4-space indentation
• Beautify index.html

[brlcad]

@jeffsieu it's generally a really bad idea to mix code beautification/indentation/style changes in with other code changes. if anything, to keep them as separate commits instead of squashing into one so the logic changes can be inspected more carefully.

I want to merge this but it'll essentially be on blind faith that there aren't issues or undesirable changes