Add ability to change a custom theme

[d3m37r4]

Add the ability to change the custom theme using the package given as an example below.
Example: https://github.com/FaCuZ/laravel-theme
Allows you to organize a system of custom themes in the application. Each user will be able to choose the desired theme of the application. Or you can make two variations of the application - a daytime light version and a night dark one.