README: clarify how to start working on this site locally

The information was all there, but a couple of concrete commands that
can be copy/pasted go a long way to be even more helpful.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

README.md

@@ -8,7 +8,15 @@ This site is built with [Hugo](https://gohugo.io/) and served via GitHub Pages.
 
 ## Local development setup
 
-It is highly recommended to clone this repository using [`scalar`](https://git-scm.com/docs/scalar); This allows to work only on the parts of the repository relevant to your interests. You can select which directories are checked out using the [`git sparse-checkout add <directory>...`](https://git-scm.com/docs/git-sparse-checkout) command. The relevant directories are:
+It is highly recommended to clone this repository using [`scalar`](https://git-scm.com/docs/scalar); This allows to work only on the parts of the repository relevant to your interests. You can select which directories are checked out using the [`git sparse-checkout add <directory>...`](https://git-scm.com/docs/git-sparse-checkout) command. Typically, you will want to start like this:
+
+```
+scalar clone http://github.com/git/git-scm.com
+cd git-scm.com/src
+git sparse-checkout set /layouts/ /content/ /static/ /assets/ /hugo.yml /data/ /script/
+```
+
+Here is a detailed list of the relevant directories:
 
 - If you want to test any page rendering using Hugo:
   - layouts/