docs: update themes' reference documentation

docs/reference/themes.md

@@ -1,15 +0,0 @@
-# Themes
-
-::: rendercv.themes
-
-## Classic Theme
-
-::: rendercv.themes.classic
-
-## Modercv Theme
-
-::: rendercv.themes.moderncv
-
-## Sb2nov Theme
-
-::: rendercv.themes.sb2nov

docs/reference/themes/classic.md

@@ -0,0 +1,3 @@
+# Classic Theme
+
+::: rendercv.themes.classic

docs/reference/themes/index.md

@@ -0,0 +1,3 @@
+# Themes
+
+::: rendercv.themes

docs/reference/themes/moderncv.md

@@ -0,0 +1,3 @@
+# Moderncv Theme
+
+::: rendercv.themes.moderncv

docs/reference/themes/sb2nov.md

@@ -0,0 +1,3 @@
+# Sb2nov Theme
+
+::: rendercv.themes.sb2nov

mkdocs.yaml

@@ -52,7 +52,11 @@ nav:
       - cli.py: reference/cli.md
       - data_models.py: reference/data_models.md
       - renderer.py: reference/renderer.md
-      - themes: reference/themes.md
+      - themes:
+          - themes: reference/themes/index.md
+          - classic: reference/themes/classic.md
+          - moderncv: reference/themes/moderncv.md
+          - sb2nov: reference/themes/sb2nov.md
   - Changelog: changelog.md
 
 markdown_extensions: