fix: readonly view

[veds-g]

• Merged readonly flag with sysInfo API
• Removed the /readonlyinfo endpoint
• Read only defaults to false, edit shared config variable server.readonly to enable it

[whynowy]

@veds-g - Thanks!

1. Comment this line since by default it's false.
2. When it's readonly, all the Create/Update/Delete APIs should return 403 forbidden.

[vigith]

2. When it's readonly, all the Create/Update/Delete APIs should return 403 forbidden.

very valid point :)

[whynowy]

LGTM