More prominent "Get help" page in our docs

[mfisher87]

Suggest the overview section, near the top. Right now we have this in the contributor guide, which feels like the wrong place. Both contributors and users need help!

Originally suggested by @jhkennedy https://openscapes.slack.com/archives/C05TMK269HA/p1778086863594129?thread_ts=1778086347.189659&cid=C05TMK269HA

[jhkennedy]

Thanks for making the issue!