Pagination for the TwentyTwenty theme

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Description

Right now the TwentyTwenty theme has a simple pagination (old/new posts links). We want it to have the same pagination as the original theme.

User Stories

As a reader of a Frontity site
I want to have access to different pages in the footer
so that I can navigate easily between pages

Possible solution

Add pagination similar to the one of the twenty-nineteen theme: