Implement /become-a-sponsor page

[jose-correia]

Implement the page at https://summit-emea.adobe.com/emea/become-a-sponsor/

This issue can be closed after all the blocks in the page have been finalized and the content is imported

Dependencies

• [x] https://github.com/adobe-basel/summit-emea-team-2/issues/14
• [ ] https://github.com/adobe-basel/summit-emea-team-2/issues/35