Update installation instructions

install.md

@@ -1,10 +1,11 @@
 # installation
 
-## SANE
+## prerequisites
+### SANE
 Get [SANE installed and working](https://github.com/sbs20/scanserv/blob/master/install-sane.md) and 
 check permissions etc
 
-## nodejs & npm
+### nodejs & npm
 Get nodejs and npm installed
 
 e.g.
@@ -20,17 +21,15 @@ Note 2: Debian calls the node binary "nodejs", which results in npm not being ab
  * `ln -s /usr/bin/nodejs /usr/bin/node`
  * `sudo apt-get install nodejs-legacy`
 
-See [run npm command gives error "/usr/bin/env: node: No such file or directory" #3911]
-(https://github.com/nodejs/node-v0.x-archive/issues/3911#issuecomment-8956154) for more details.
+See [run npm command gives error "/usr/bin/env: node: No such file or directory" #3911](https://github.com/nodejs/node-v0.x-archive/issues/3911#issuecomment-8956154) for more details.
 
-## web app
-Download the [latest release](https://github.com/sbs20/scanservjs/releases) and unzip.
+## scanserv-js (the application)
+Run the following:
 
-e.g.
 ```
 wget -O ~/scanservjs.tar.gz $(curl -s https://api.github.com/repos/sbs20/scanservjs/releases/latest | grep browser_download_url | cut -d '"' -f 4)
 tar -xf scanservjs.tar.gz
 sudo ./scanservjs/install.sh
 ```
 
-Then see [install](install.sh)
+Or have a look at [other releases](https://github.com/sbs20/scanservjs/releases)