fix: css and js for index and register work

...va/unipotsdam/gf/core/management/pageAppearance/Menu.java

...m/gf/core/management/pageAppearance/OmniDependencies.java

.../java/unipotsdam/gf/core/management/user/UserService.java

gemeinsamforschen/src/main/webapp/appearance/register.js

gemeinsamforschen/src/main/webapp/core/footer.css

gemeinsamforschen/src/main/webapp/core/footer.js

gemeinsamforschen/src/main/webapp/core/utility.js

gemeinsamforschen/src/main/webapp/index.jsp

...mforschen/src/main/webapp/libs/css/Contact-Form-Clean.css

...samforschen/src/main/webapp/libs/css/Login-Form-Clean.css

...insamforschen/src/main/webapp/libs/css/Sidebar-Menu-1.css

gemeinsamforschen/src/main/webapp/libs/css/Sidebar-Menu.css

gemeinsamforschen/src/main/webapp/libs/css/Sidebar-Menu1.css

gemeinsamforschen/src/main/webapp/register.jsp