README.md: update pokynů k začátku vývoje

README.md

@@ -13,12 +13,12 @@ Use git :-)
 
 Quickstart
 ----------
+Run the following commands:
+	make install_venv
+	. env/bin/activate
+	make install_web
 
-Install the following packages in Debian/Ubuntu: `libpq-dev python-dev python-setuptools python2.7 libjpeg-dev libpng12-dev`. Then run:
+After finishing development, run "deactivate".
-
-  make
-  ./manage.py testdata
-  make run
 
 Make commands
 -------------