[General] Secure/Separation of configuration files

[inhwaS]

Since we have multiple files related to configurations,

• ./server/.env.local : supabse request, response configuration
• ./server/supabase/config.toml : supabase general configuration
• ./server/supabase/functions/.env : configuration for OpenAI API key
• ./web/.env.local : supabse request, response configuration

We need to clean up and store in more secured space or any other better way.

[GuoFan1996]

./server/supabase/functions/.env : This one also stores PUPPETEER_BROWSERLESS_IO_KEY