Add local & deployment build instructions.

Author: horacekj

README.md

@@ -7,11 +7,15 @@ The site is available at <https://mtb.kmz-brno.cz/>.
 The web is developed using [Jekyll](https://jekyllrb.com/). It uses
 [TtskchTheme](https://github.com/ttskch/jekyll-ttskch-theme) theme.
 
-## Local gems & deployment
+## Local installation
 
-Install gems this way:
-
-```
+```bash
 $ bundle config --local path vendor
+$ bundle install
+```
+
+## Deployment
+
+```bash
 $ bundle install --deployment
 ```