[Feature / Refactor] Improved permissions and updated seller experience

[JustSamuel]

When the permissions are updated in the backend we should also update them in the dashboard.

Possibly create a "seller overview" page where seller accounts can get some key info and also check some stats. Also allow them to create products within their own containers, because I have a feeling that the current product page does not like it when your not BACPM.

[SuperVK]

I've split this out to the two underlying issues:

• Permission refactor: [Refactor] Permissions based rendering per component #265
• Seller overview: [Feature] Seller overview #266