[Contact form] Mentors contact form

[jlbellido]

We need a new contact form for looking for volunteers at the event. The contact form will have the following fields:

• A nice message at top
• Name
• Email
• Subject
• Message
• Captcha

[lluvigne]

WIP

[keilovecraft]

The styles are ready for @lluvigne pull request :dancing_women:

[jlbellido]

Done! Thanks @lluvigne for your here! And apologize for reviewing it so late. Check https://github.com/jlbellido/devdaysseville/commit/5779fae15f239b3b6e61c724108ba3832283af25 at the block class because I think it is interesting for you.

Thanks!