Create image carousel - Opportunities page

[jaytiaki]

Create an image carousel on 'Opportunities' page, below main header/banner, to highlight key opportunities and/or developments

Carousel should contain the following:

• Image for CNCF Contributor page: www.contribute.cncf.io
  

• Promo for KCNA mentoring cohort (link to local Meetup for info session)
  https://www.meetup.com/login/?returnUri=https%3A%2F%2Fwww.meetup.com%2Fcloudnative-nz%2Fevents%2F287343698
  

• Promo for Raspberry Pi 400 giveaway (internal link, mailing list)