feat(markdown): Work on backend docs

markdown/dev/reference/backend/api/patterns/delete/en.md

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+---
+title: Delete a Pattern
+---
+
+Deletes an existing Pattern.
+
+## Access control
+
+- [Permission level](/reference/backend/api/rbac) `4` or higher is required to delete a Pattern
+- [Permission level](/reference/backend/api/rbac) `8` is required to delete **another user's** Pattern
+
+## Endpoints
+
+Deleting a Pattern is possible via these endpoints:
+
+| Method    | Path | Authentication |
+| --------: | :--- | :------------- |
+| <Method delete /> | `/patterns/:id/jwt` | [JSON Web Token](/reference/backend/api/authentication#jwt-authentication) |
+| <Method delete /> | `/patterns/:id/key` | [API Key & Secret](/reference/backend/api/authentication#key-authentication) |
+
+## Request url
+
+The url should contain the ID of the Pattern you wish to remove.
+It replaces the `:id` placeholder in the [endpoints listed above](#endpoints).
+
+## Response status codes
+
+Possible status codes for these endpoints are:
+
+| Status code | Description |
+| ----------: | :---------- |
+| <StatusCode status="204"/> | success |
+| <StatusCode status="400"/> | the request was malformed |
+| <StatusCode status="401"/> | the request lacks authentication |
+| <StatusCode status="403"/> | authentication failed |
+| <StatusCode status="500"/> | server error |
+
+## Example request
+
+```js
+await axios.delete(
+  'https://backend.freesewing.org/patterns/10/jwt',
+  {
+    headers: {
+      Authorization: `Bearer ${token}`
+    }
+  }
+)
+```
+
+## Example response
+
+```204.json
+```
+<Note>
+These endpoints return status code <StatusCode status="204"/> (no content) on
+success, with no response body.
+</Note>
+