Call the `browse_all` function only from regions/shelves.py; remove it elsewhere

[AlexandraMoga]

We are currently calling the browse_all function both from pages/home.py and from regions/shelves.py. We should avoid duplications and use only the function in regions/shelves.py because it is a shelf specific function.

[KushalBeniwal]

@AlexandraMoga if no-one is working on it then I would like to work on this issue.

[AlexandraMoga]

@KushalBeniwal Thanks for your interest in helping with this issue. There have been a few changes that affect this component which I would like to revisit myself. It is not as straightforward as I thought in the beginning.

[addymistrel]

I have gone thorugh the issue and it would be wonderful if I get to work on this issue