Get Involved: add text to develop your own app

I also added a button
Get Involved: share data - shrunk text a bit
Merge pull request #1131 from beej23/patch-133

Get Involved: share data - shrunk text a bit
Stories: carrousel
Merge branch 'feature/landing-page' of github.com:Vizzuality/gfw into feature/landing-page
New icon
About: Added to contact us page

Can we format the address so it looks good?

I added a button that should link to the feedback page, but wasn't sure what link to include.
Update "you may find this interesting"
Merge pull request #1133 from beej23/patch-135

Update "you may find this interesting"
Merge pull request #1132 from beej23/patch-134

About: Added to contact us page
Merge pull request #1130 from beej23/patch-132

Get Involved: add text to develop your own app
Get Involved: Header code fix
Applications fix
Merge branch 'feature/landing-page' of github.com:Vizzuality/gfw into feature/landing-page
Merge pull request #1134 from beej23/patch-136

Get Involved: Header code fix
Data: adding intro text to download page
Merge pull request #1135 from beej23/patch-137

Data: adding intro text to download page
Merge branch 'feature/landing-page' of github.com:Vizzuality/gfw into feature/landing-mailchimp
Landing mailchimp: link target
Testing mailchimp