x/website: place the link to go.dev/project in a more visible place

[hyangah]

The project tab in the old page (golang.org) was my most frequently visited place.
After unifying to go.dev, I found the page was not easily discoverable.
Eventually, I found a link at the bottom of the page, which is with "About".

Can we place the go.dev/project page or contribution guide page in a more visible location than this, so contributors can find where to go easily from go.dev?

Additionally,

• Is there a reason that "Connect" is linked to the golang's twitter account? Is it the primary contact point?

[thanm]

@rsc