paginate session list

[yinonov]

Is your feature request related to a problem? Please describe.
Session list items are all listed to a 1 page which makes it hard to locate a specific session by URL. this also burdens the page's performance and there would be many rendered sessions as we scale

Describe the solution you'd like
Paginate the session list

Describe alternatives you've considered
an alternative would be a virtual infinite scroll or load more... button but then it wont solve the URL location issue.

Additional context

Definition of done:

• Pagination should manage firestore paginated queries rather than load all sessions at once to be and handle pagination only on client
• Sessions are sorted by descending date