Redesign Communities page

[mark-a-wilson]

Based on feedback received (#397), the design and content of the Communities page needs to be reworked.

Acceptance Criteria

• [ ] Organize content of this page around the 4 or 5 channels/platforms (e.g. Teams, Rocket.Chat, Yammer) through which communities can be found
• [ ] Within this organization, find a way to highlight the most prominent/largest/most active communities that have been identified through research (e.g. Data Science CoP, DevOps Commons)
• [ ] Clarify what is "the Digital Delivery Network", whether this is different from "the BCDevExchange" or synonymous, and whether a blurb about it belongs on the "Communities" page or the "Products & Services" page
• [ ] Links to communities are shown by default (i.e. not hidden in the collapsed accordion body)

[mark-a-wilson]

Closing this Epic and will recompose later.