docs: keep only reference documentation, archive one-offs

docs/CSS.md

@@ -10,7 +10,7 @@
 - **`typography.css`** — type scale
 - **`utilities.css`** — utility classes and spacing tokens
 - **`style.css`** — main public entry point (via `@import` chain)
-- Page-specific: **`public.css`** (home), **`tfe.css`**, **`repertoire.css`**, **`content-page.css`** (about/licences), **`system.css`** (admin system dashboard), **`file-access.css`**, **`admin.css`** (admin section)
+- Page-specific: **`public.css`** (home), **`tfe.css`**, **`repertoire.css`**, **`content-page.css`** (about/licences), **`system.css`** (admin system dashboard), **`file-access.css`**, **`not-found.css`** (404), **`admin.css`** (admin section)
 - Form: **`form-base.css`** + **`form-admin.css`** (plus FilePond vendor CSS)
 
 ## Build / bundling
@@ -19,9 +19,11 @@ Source CSS is **bundled and minified** by `scripts/build-css.mjs` (lightningcss)
 into `app/public/assets/dist/*.min.css`:
 
 - `base.min.css` — resolves the `@import` chain in `style.css` into one file (eliminates ~17 sequential imports)
-- `admin.min.css` — minified `admin.css`
+- `admin.min.css` — minified `admin.css` (+ FilePond vendor CSS, for the CSV import dialog)
 - `form.min.css` — `form-base.css` + `form-admin.css` + FilePond vendor CSS
-- plus individual `.min.css` for the page-specific files
+- `form-base.min.css` — `form-base.css` standalone (partage pages without FilePond)
+- `partage-form.min.css` — `form-base.css` + FilePond vendor CSS (partage pages with FilePond)
+- plus individual `.min.css` for the page-specific files (`public`, `tfe`, `repertoire`, `content-page`, `not-found`, `system`, `file-access`)
 
 Run with `just build-css` / `just dev-build`. Never commit hand-edits into
 `dist/` — they are generated.