feat: subgraph plugin

[fernandomg]

Closes #202

Description:

This PR cleans the codebase to give place to the plugin-in system.

The idea behind this change is to allow dAppBooster to add/remove features or functionalities, without needing them to be all included in the codebase.

It's rusty somehow, as there are traces of code here and there that's related to SGs, but it's intentional to ease the migration to the landing page project.

The rest is all documented in the plugin project. See db-subgraphs for more info.

Steps:

Check that nothing breaks in the project build, and that would be all.

[!NOTE] docs.dappbooster will fail as it's tied to the repo, and while docs branch is not merged, it will continue failing because is trying to run a script that is not in the rest of the repo.

Type of change:

• [ ] New feature
• [ ] Bug fix
• [x] Breaking change
• [x] Enhancement
• [x] Refactoring
• [x] Chore

How Has This Been Tested?

• [x] Manual testing
• [ ] Automated tests
• [ ] Other (explain)

Remember to check that:

• Your code follows the style guidelines of this project
• You have performed a self-review of your code
• You have commented your code in hard-to-understand areas
• You have made corresponding changes to the documentation
• Your changes generate no new warnings

Screenshots

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Name	Status	Preview	Comments	Updated (UTC)
dappbooster	✅ Ready (Inspect)	Visit Preview		Sep 10, 2024 8:25am
docs.dappbooster	❌ Failed (Inspect)			Sep 10, 2024 8:25am