feat: page-number-based pagination on homepage

[iuioiua]

This PR:

1. Introduces page-number-based pagination to the homepage.
2. Refactors much of the database-related code to be more straightforward.
3. Changes the homepage to show only the items posted in the last week.
4. Supercedes fix: pagination order #236
5. Moves functionality closer to proposal: complete homepage functionality #211
6. Closes proposal: pagination with numbers  #233
7. Closes bug: pagination seems to break the order of Items #231

Note: once merged, these same changes can be made to paginate item and user pages.

Please feel free to review, @brunocorrea23 and @huai-jie.

[huai-jie]

Does this PR gonna tackle New votes per day functionality that is mentioned in #202?

[iuioiua]

Not so much. We can do that in another PR.

[brunocorrea23]

@iuioiua , thanks for the work here and for requesting the review.
Really liked the db refactor.

Couple of comments on the proposed solution.

• It seems that the items older than a week are never accessible to the users, right? Is this the intended behavior?
• 'Loading' all items for the last week provides no guarantee of the amount of items that will be 'loaded'. Although it is better than loading the whole db at once, I feel this kind of defeats the purpose of pagination.

Wdyt?

[iuioiua]

• It seems that the items older than a week are never accessible to the users, right? Is this the intended behavior?

Yes, as it stands now. Later, we can add functionality to make the window customisable.

• 'Loading' all items for the last week provides no guarantee of the amount of items that will be 'loaded'. Although it is better than loading the whole db at once, I feel this kind of defeats the purpose of pagination.

True, the amount of loading is sub-optimal. This will be fixed if/when Deno.Kv.count() is implemented.

Does the PR look good to you?

[brunocorrea23]

ok, thanks for the clarification!

LGTM