Make Google env variables optional

[cfurrow]

📝 Description

Make GOOGLE* environment variables optional for those that do not want, or need them.

📋 Checklist

• My code follows the project conventions
• This PR includes breaking changes
• I have updated documentation if necessary
• Remove "Sign in with Google" from the login and sign-up pages if the env vars are not set

🗃️ Prisma Migrations (if applicable)

• I have created a migration
• I have tested the migration locally

📸 Screenshots (if applicable)

When Google env vars are not set

When Google env vars are set

🔗 Related Issues

#192

[vercel]

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