#49 Moved rmctrl-main-screen.jsp to Spring MVC

- Moved JSP under WEB-INF
- Created a controller for that JSP
- Removed old CellinkName logic since now we don't jsp-include it, but
 rather pass all required data from controller

Additionally:
- toplang.jsp was changed since it was using `request.requestURL` while
 that field was changed by jsp-include to `WEB-INF/blah.jsp`