Merge branch 'revert-7a31b3c4' into 'main'

...c/cf/spring/demo/exception/ResourceNotFoundException.java

...ain/java/uk/ac/cf/spring/demo/sports/Userdetail/User.java

...k/ac/cf/spring/demo/sports/Userdetail/UserController.java

...a/uk/ac/cf/spring/demo/sports/Userdetail/UserService.java

.../ac/cf/spring/demo/sports/Userdetail/UserServiceImpl.java

...java/uk/ac/cf/spring/demo/sports/Userdetail/Userform.java

.../java/uk/ac/cf/spring/demo/sports/Userdetail/userDao.java

.../uk/ac/cf/spring/demo/sports/security/SecurityConfig.java

...a/uk/ac/cf/spring/demo/sports/security/SecurityUtils.java

...a/uk/ac/cf/spring/demo/user/CustomUserDetailsService.java

src/main/java/uk/ac/cf/spring/demo/user/UserRepository.java

...uk/ac/cf/spring/demo/user/controller/LoginController.java

.../uk/ac/cf/spring/demo/user/controller/UserController.java

src/main/resources/static/css/backGroundUser.css

src/main/resources/static/html/backGroundUser.html

src/main/resources/static/html/navBar.html

src/main/resources/static/js/backGroundUser.js

src/main/resources/static/js/navBar.js