Fix logic for posts made yesterday + remove previous post edit button

[MattVwaves]

Description

• Posts made yesterday are currently not being displayed correctly

• There is currently an overlap of the previous edit button container and the new edit icon

Implementation

• The current date logic includes a function isYesterday which is not functioning correctly, as it always produces false

• instead of using isYesterday to get the date of yesterday we can use: const yesterday = sub(new Date(), { days: 1 })

• we can then further extract just the day from this date and check with the postDay

• For the post edit button the previous container simply has to be removed