Update README

.gitmodules

@@ -1,3 +1,4 @@
 [submodule "themes/linkita"]
 	path = themes/linkita
 	url = https://codeberg.org/salif/linkita.git
+	branch = linkita

README.md

@@ -12,3 +12,26 @@
 - [Zola Themes Collection](https://salif.github.io/zola-themes-collection/)
 - [Kita theme](https://github.com/st1020/kita)
 - [Hugo-Paper theme](https://github.com/nanxiaobei/hugo-paper)
+
+## Set up for contributing
+
+Fork this demo repository and/or the theme repository.
+
+Replace `YOUR-USERNAME`:
+
+```sh
+# Step 1:
+# If you forked the demo repository:
+git clone --recurse-submodules https://codeberg.org/YOUR-USERNAME/linkita-demo.git
+# Otherwise:
+git clone --recurse-submodules https://codeberg.org/salif/linkita-demo.git
+
+# Step 2: Only if you forked the theme repository:
+cd linkita-demo/themes/linkita
+git remote add downstream https://codeberg.org/YOUR-USERNAME/linkita.git
+
+# If you do changes in the theme repository:
+git checkout -b feature
+git commit
+git push downstream feature
+```

justfile

@@ -19,11 +19,20 @@ serve-and args='':
 [group('dev')]
 serve: serve-and
 
-[doc('git push')]
 [group('dev')]
+zola-check:
+    command {{ zola }} check
+
+[doc('git commit')]
+[group('git')]
+commit-demo: zola-check format
+    command {{ git }} commit
+
+[doc('git push')]
+[group('git')]
 push-demo:
-    command {{ git }} push codeberg-demo demo
-    command {{ git }} push github demo
+    command {{ git }} push codeberg-demo demo:demo
+    command {{ git }} push github demo:demo
 
 [doc('Format source code')]
 [group('dev')]