Add Governance to the site

[maximlt]

I thought it'd be a good idea to expose HoloViz's governance docs to the community.

[droumis]

There is currently a Governance section on the About page that links out. I don't have a strong opinion about elevating Governance to its own nav tab, but the content should probably be merged so that it's in one place. I'm a little bit concerned about the effect that adding more top-level pages has on the navigability of the website. But not concerned enough yet to block this. We can always reorganize/nest things later.

[maximlt]

Good catch, I didn't know there was a Governance section on the About page :)

I'm a little bit concerned about the effect that adding more top-level pages has on the navigability of the website.

I'm not too concerned about that since they're all displayed in the side bar on the landing page. I hope one day the theme allows us to better configure how things get displayed in the nav bar.