various improvements

[jcohenadad]

these suggestions come from feedback from various ppl

• contact us: put email at the top
• contact us: “delivery” change for “mailing address”
• contact us: the picture says 'way to parking"-- it is weird. just say "parking"
• contact us: Consider adding an embedded gmaps.
• remove billing address
• contact us: put entire email address (not separated with at), replace with neuropolylab address, put at the top
• add “home” icon next to the github icon for ppl browsing on their phone
• section facilities/software: the wording is iffy
• école polytechnique is not written consistently with an accent.