doc: re-structured the doc folder

doc/architecure/song-type.md

@@ -1,24 +0,0 @@
-# Song Type
-
-The Unrelated type refers specifically to videos that are not in our [Scope of Inclusion](../about/scope-of-inclusion).
-
-## Table: `songs`
-
-The `type` column used in the `songs` table.
-
-| Type | Description            |
-| ---- | ---------------------- |
-| 0    | Unrelated              |
-| 1    | Original               |
-| 2    | Cover                  |
-| 3    | Remix                  |
-| 4    | Instrumental           |
-| 10   | Others                 |
-
-## Table: `labelling_result`
-
-| Label | Description            |
-| ----- | ---------------------- |
-|   0   | AI tagged: Unrelated   |
-|   1   | AI tagged: Original    |
-|   2   | AI tagged: Cover/Remix |

doc/en/README.md

@@ -21,4 +21,4 @@ This doc contains various information about the CVSA project, including technica
 
 ### Jump right in
 
-<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="files"></th><th data-hidden></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>About CVSA</strong></td><td>Some information you might want to know about.</td><td></td><td></td><td><a href="./">.</a></td></tr><tr><td><strong>Architecture</strong></td><td>The technical details about how CVSA was built.</td><td></td><td></td><td><a href="broken-reference">Broken link</a></td></tr><tr><td><strong>API Doc</strong></td><td>Documentation about APIs provided by CVSA.</td><td></td><td></td><td><a href="broken-reference">Broken link</a></td></tr></tbody></table>
+<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="files"></th><th data-hidden></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>About CVSA</strong></td><td>Some information you might want to know about.</td><td></td><td></td><td><a href="./">.</a></td></tr><tr><td><strong>Architecture</strong></td><td>The technical details about how CVSA was built.</td><td></td><td></td><td><a href="../broken-reference/">broken-reference</a></td></tr><tr><td><strong>API Doc</strong></td><td>Documentation about APIs provided by CVSA.</td><td></td><td></td><td><a href="../broken-reference/">broken-reference</a></td></tr></tbody></table>