feature: Add env variable for the absolute path of server url location & update fixed localhost endpoint accesses

[Deadreyo]

Type of feature

Select the type of feature request, the lowercase should also be the PR prefix.

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation Update
• 🎨 Style
• 🧑‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🤖 Build
• 🔁 CI
• 📦 Chore (Release)
• ⏩ Revert

Current behavior

Is your feature request related to a problem? Please describe.

Currently in places in the code, we get some resources by calling our own endpoints, example:
<img src="http://localhost:3006/favicon.ico" ...
This only works for local development and will need adjusting to be ready for deployment.

Suggested solution

Describe the solution you'd like.

Add an environment variable to hold the url of the server and update such pieces of code in the app to use that variable.

Alternatively if possible, find a way to be able to import images in satori without visiting server's own endpoints for them.

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[0-vortex]

Sort of done in https://github.com/open-sauced/opengraph.opensauced.pizza/releases/tag/v1.0.0 we using base64 instead of the static folder, can be improved but not with env vars now, with our design system maybe