docs: update documentation to OKF v0.1 format

docs/architecture/config-schema.md

@@ -41,13 +41,15 @@ environment for the container to boot.
 `DEFAULTS` in `config.py` provides fallback strings that `apply_defaults`
 fills into the merged map **before** validation runs:
 
-| Default key           | Default value     |
-|-----------------------|-------------------|
-| `VISIBILITY`          | `public`          |
-| `THROWNBACK_PREFIX`   | `Throwback:`      |
-| `MAX_RETRIES`         | `3`               |
-| `TZ`                  | `Europe/Berlin`   |
-| `RUN_AT`              | `09:00`           |
+| Default key           | Default value                              |
+|-----------------------|-------------------------------------------|
+| `VISIBILITY`          | `public`                                   |
+| `THROWNBACK_PREFIX`   | `Throwback:`                               |
+| `MAX_RETRIES`         | `3`                                        |
+| `TZ`                  | `Europe/Berlin`                            |
+| `RUN_AT`              | `09:00`                                    |
+| `BLOG_REPO_URL`       | `https://git.chaospott.de/Chaospott/site`  |
+| `BLOG_DIR`            | `blog` (resolved relative to `data_dir`)   |
 
 Because every required key carries a default, a freshly-initialised
 container can still boot to validate the scaffold, but the operator
@@ -68,6 +70,8 @@ ideally `SITE_URL`) to make a real run.
 | `run_at`                | `str`     | `RUN_AT`                                     |
 | `tz`                    | `str`     | `TZ`                                         |
 | `data_dir`              | `Path`    | Constant: `Path("/app/data")`                |
+| `blog_repo_url`         | `str`     | `BLOG_REPO_URL`                              |
+| `blog_dir`              | `Path`    | `BLOG_DIR` resolved against `data_dir`       |
 
 # Validation Behaviour
 
@@ -80,6 +84,8 @@ problem joined with `"; "`. Validation covers:
 * `MASTODON_BASE_URL` and `SITE_URL` parse via `urllib.parse.urlparse`
   with an `http`/`https` scheme and a non-empty `netloc`.
 * `VISIBILITY` is one of `{"public", "unlisted"}` (`ALLOWED_VISIBILITY`).
+* `BLOG_REPO_URL` (optional, has default) parses via `urllib.parse.urlparse`
+  with an `http`/`https` scheme and a non-empty `netloc` when present.
 * `TZ` resolves via `zoneinfo.ZoneInfo`.
 * `MAX_RETRIES` parses as a non-negative integer (rejects bools).