Summary:
Removed the YB Intro dialog. [[ https://yugabyte.slack.com/archives/C049RJFEV1T/p1759532030548919 | Context ]]
Removed associated local storage code.
Added the read docs option to the footer

Test Plan:
Tested manually

{F402786}

Reviewers: lsangappa

Reviewed By: lsangappa

Differential Revision: https://phorge.dev.yugabyte.com/D47378