chore: organize docs

[leovct]

Description

• Move internal docs to docs/internal.
• Move articles ready to be published to Polygon docs to docs/draft.
• Question: We could have some folder e.g. public or stable for the official documentation?

References (if applicable)

x

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
1 Security Hotspot

See analysis details on SonarCloud

[leovct]

Closing this PR as the tool used to publish our docs only allow official docs to be placed in a root folder called docs...

Too bad... We could have had something like the following to organise our docs better:

docs/
  internal/
  draft/
  public/