Update readme to use serve so non html links work

Author: KeiranWDigital

README.md

@@ -57,15 +57,13 @@ Open a command line in the root directory of the repository.
 
 If this is the first time you have built the site, make sure you have run `bundle pack` before attempting to build the site using jekyll.
 
-Otherwise, run `bundle exec jekyll build` to build the site, this will produce a `_site` folder with the required content.
+Otherwise, run `bundle exec jekyll serve` to build the site, this will produce a `_site` folder with the required content and start a local server (usually at 127.0.0.1:4000)
 
->:Warning: do not edit anything in the site folder as it will not be comitted and is overwritten everytime you build the site.
+The site rebuilds after every change, so just refresh the page in your browser to see the changes. 
 
-To rebuild the site after a file change append `--watch` to the end of the command. 
+>:Warning: do not edit anything in the site folder as it will not be comitted and is overwritten everytime you build the site.
 
-e.g. `bundle exec jekyll build --watch`
 
-Once you have a `_site` folder open the `index.html` file inside to view the site.
 
 ## Includes