Club Signup fix.

[akshatvg]

The club signup logic had a security flaw due to which we want to migrate to invite code based signup or send a verification link via email to create a whitelisted club's account.

Make the required changes in the frontend if you continue with invite code or the frontend as well as backend for verification links.

• Invite code based signup documentation
• Club signup frontend page's component for the /club/signup route (currently commented in here).

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