feat: add account-sharing page

[rishtigupta]

PR Description:

• This commit adds another section to the main docs page for account-sharing feature:

• Clicking on the "learn More" page takes you to a newly created account-sharing page (pull the pr locally to view the entire page):

Issue:

https://github.com/momentohq/momento-console/issues/853

[danielamiao]

Thank you for the initial pass here! A few requested changes:

1. Could you line up the account sharing section with the boxes above? Right now the account sharing box is wider than the boxes above it
2. Change You are allowed to remove yourself from the account if you are not the account owner. to You cannot remove yourself from the account if you are the account owner.
3. Under Switch Accounts section, add a first bullet: "If you are added to multiple accounts, you can switch between accounts inside the Momento Console."
4. Under Member Limit section, add a note at the end: "You can also request a higher limit by emailing Momento at [email protected]"

[anitarua]

Looks great! Another suggestion if possible: add subheadings under "How to Use Account Sharing" that link to each of the 3 examples?

[anitarua]

lgtm!

[cprice404]

what happens if they type an e-mail address that has never logged in to the Momento console?

[rishtigupta]

The user will not be identified by the server and we throw an error on console saying "User could not be found."

[cprice404]

okay. i just tested it and I see what you mean. This PR is good then, but we should create a ticket for the console itself to augment that error message a bit, so that users will know what the remedy is if they get that error.

[cprice404]

just one question and a few minor nits

[cprice404]

lgtm but we should hold off on merging it until we release the console changes.