Add link to VLE.html on main menu
Add authentication JavaScript from Gateway page
https://gateway.thomasdeaconacademy.peterborough.sch.uk/CookieAuth.dll?GetPic?formdir=3&image=flogon.js
Add VLE page
Merge branch 'develop' into feature/vle
Remove depreciated `useSplashScreen`
Add character encoding declaration
Remove depreciated code and add new code
Fix spacing & remove more depreciated code
Remove extra closing `div`
Fix broken `</html>`
Remove unnecessary HTML comment code from JS
Add successful login test page
Add test button
Permit use of browser history
Test access restrictions
Add InAppBrowser launch code
with test URLs
Modify code formatting for single page view
Move JS to header
Move `id="testbutton"`
Update URL whitelist