Added the overview & community council pages.

[RitaOC]

This PR contains the community leadership coverted content in the community handbook.

[RitaOC]

Kindly Review @RCheesley @favour-chibueze @fakela

Issue: #218

[RCheesley]

@RitaOC could you please check the heading underlines? They must always be the exact length of the heading that they are beneath.

Thanks!

[RitaOC]

@RitaOC could you please check the heading underlines? They must always be the exact length of the heading that they are beneath.

Thanks so much @RCheesley, I've worked on it.
Awaiting your review

[RCheesley]

This is GTG now the vale fixes are addressed. The linter is failing because it seems to be trying to lint the entire docs directory rather than just these changed files - not sure why but we will address in another PR.