The great refactor (#82)

.github/readme/partials/documentation/organizations.md

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+### 🏦 Organizations metrics
+
+While metrics targets mainly user accounts, it's possible to render metrics for organization accounts.
+
+![Metrics (organization account)](https://github.com/lowlighter/lowlighter/blob/master/metrics.organization.svg)
+
+<details>
+<summary>💬 Metrics for organizations</summary>
+
+Setup is the same as for user accounts, though you'll need to add `read:org` scope, **whether you're member of target organization or not**.
+
+![Add read:org scope to personal token](.github/readme/imgs/setup_token_org_read_scope.png)
+
+You'll also need to set `user` option with your organization name.
+
+If you're encounting errors and your organization is using single sign-on, try to [authorize your personal token](https://docs.github.com/en/free-pro-team@latest/github/authenticating-to-github/authorizing-a-personal-access-token-for-use-with-saml-single-sign-on).
+
+Most of plugins supported by user accounts will work with organization accounts, but note that rendering metrics for organizations consume way more APIs requests.
+
+To support private repositories, add full `repo` scope to your personal token.
+
+#### ℹ️ Example workflow
+
+```yaml
+- uses: lowlighter/metrics@latest
+  with:
+    # ... other options
+    token: ${{ secrets.METRICS_TOKEN }}          # A personal token from an user account with read:org scope
+    committer_token: ${{ secrets.GITHUB_TOKEN }} # GitHub auto-generated token
+    user: organization-name                      # Organization name
+```
+
+</details>
+
+<details>
+<summary>💬 Organizations memberships for user accounts</summary>
+
+Only public memberships can be displayed by metrics by default.
+You can manage your membership visibility in the `People` tab of your organization:
+
+![Publish organization membership](.github/readme/imgs/setup_public_membership_org.png)
+
+For organization memberships, add `read:org` scope to your personal token.
+
+![Add read:org scope to personal token](.github/readme/imgs/setup_token_org_read_scope.png)
+
+
+</details>