Add error page for 405 status

[php-coder]

At this moment it looks like:

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sun Jul 18 16:57:19 NOVT 2021
There was an unexpected error (type=Method Not Allowed, status=405).
Request method 'POST' not supported

and the following message is logged:

2021-07-18 16:57:19.291 [user: ] WARN 6198 --- [ qtp18999715-48] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported]