Improve the guide in the CONTRIBUTING.md for new contributors

[AjayiMike]

The PR Improved the guide in the CONTRIBUTING.md for new contributors. expecially those that are new to supabase

Changes made

• Docker section - Ensures that the new contributor have their docker daemon running before running the supabase start command. Also linked to docker installation manual page in a case where they don't have it installed
• Corrected the value set for NEXT_PUBLIC_SUPABASE_URL - says<API KEY> instead of <API URL>
• Make the "Set up accounts table signer encryption" steps clearer

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Name	Status	Preview	Comments	Updated (UTC)
herocast	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 21, 2024 10:00pm