add @stack('content')

[AMoktar]

Question	Answer
Issue or Enhancement	Enhancement
License	MIT

What's in this PR?

jsut added single line @stack('content') to enable @push to 'content'

Checklist

• I've tested changes manually, since I didn't manage to figureout how jeroennoten/Laravel-AdminLTE/tests work, I'm getting errors like
  Failed asserting that directory "test-folder-copy" does not exist.

I'd be happy if you helped me for running /tests
Thanks

[dfsmania]

@AMoktar Please revert the active checker change, since it break backward compatibility and fails on tests. I will try to found a solution for your special use case when I get some free time from work...

Then, I will check if stack() may be useful for other yielded sections too...

[dfsmania]

Revert the changes on the ActiveChecker class

[dfsmania]

@AMoktar Please, give me some time. Before merging I would like to check if it's convenient to add @stack() to other yielded sections too.

[dfsmania]

Ok, I did not find any other section where adding @stack() may be useful. In content it makes sense, so you can keep extending an already defined view to @push() additional content to it.