Merge branch 'patch-1' into 'master'

Update README.md: installing submodules

See merge request hifis/hifis.net!134

README.md

@@ -16,11 +16,15 @@ is built using Jekyll.
    ```bash
    bundle install
    ```
-4. Build and preview the web page.
+4. Install submodules (currently `bootstrap`, `Font-Awesome`, `jquery`, `MathJax`).
+   ``` bash
+   git submodule update --init --recursive
+   ```
+5. Build and preview the web page.
    ```bash
    bundle exec jekyll serve --future
    ```
-5. Add content.
+6. Add content.
 
 Execute the commands above from the root of your repository.