Added functionalities to restrict certain user operations like update, password change, and deletion in demo mode. This is done to prevent demo users from modifying crucial data. Helper methods are created for standard re-usable checks. Also, Blade directive is added for frontend UI demo checks.
The copyright link in the footer of the private layout app has been updated in this revision. Previously, it was pointing to a Github account, kor-elf. It is now pointing to the actual repository, which now resides on git.kor-elf.net. In addition to this, the full name of the owner, Leonid Nikitin (kor-elf), has been added for better transparency and clarity.
