Added text files, added social media requirements.

Added robots and humans text files. Added the social media meta data to
the index file. Made a css file. Took away the margin on the body.
Added a placeholder logo and a background to the header.
Added js file. Added nav icon.

Added navigation icon javascript and css.
Added nav and footer.

Added nav content to the header. When the nav icon is clicked, the
content appears on the side. Added a footer and made it so that it
stays on the bottom of the page. Added the logo to the footer.