Relying Party sequence diagram, examples and editorials (#91)

* fix: [RP] same device uri

* feat: implementation and security consideration for securing sessions in the cross device flow

* chore: cleanup

* feat: added non nroamtive example for RP cross device sec cons

* fix: same device universal link and random parameter valur for request_uri endpoint

* fix: Relying Party flows, seq diagrams and editorials

* fix: qrcode

* fix: typo

* fix: editorials

* fix: qrcode size

* fix: qrcode size

* fix: qrcode size

* fix: qrcode size

* Apply suggestions from code review

Co-authored-by: Francesco Grauso <[email protected]>

* Apply suggestions from code review

* fix: RP seq, user-agent label

* fix: RP seq, editorials

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Co-authored-by: Francesco Grauso <[email protected]>