Feature/redesign header footer

[amandujano]

I'm opening this PR from feature/redesign-header-footer to develop in order to set the following:

• add basic layout and style
• add initial sections in the site
• set the default translation processor

Screenshots

initial index

initial menu sections

Mock programs page.

note that there is no content in this page, it is still in work in progress

[mxochicale]

Thanks @amandujano for your great contributions. This should be ready to be merge unless you have any other changes to do!