* WIP update
* init mutual auth topic page
* WIP
* update JWT verification guide
* s/Java/Json/g
* remove Mutual Auth topic page and references
The new page will be reviewed and added as a separate PR
* fix JSON capitalization throughout
* copy edit to jwt-verification.md
Co-authored-by: cmo-pomerium <91488121+cmo-pomerium@users.noreply.github.com>