[5.3] Add BROADCAST_DRIVER on .env

Having pusher keys, the file should contain the key for the broadcast also.

Use module name instead of path

Update email address

Update server.php email address

Fix order

GitIgnore PHPStorm's config directory

If you open a (laravel) project in phpstorm, it places a `.idea` folder in the project root. This contains project-specific ide settings. You usually don't want to include such files in a git repo.

Use const instead of var in Vue instance

Reference to Pull Request #3871

[5.3] Use const instead of var in require

[5.3] Use arrow functions instead of functions

[5.3] Delete app/Http/Requests directory

Use double quotes; Remove un-used fonts

Fix missing word in docblock

the word "framework" was missing. I also managed to make the docblock
fit Laravel's style by changing around some of the wording while keeping
the general message the same.