Remove posts/_user_details partial.
Remove posts/_user_details partial.

It makes no sense to have these four lines as a partial. This is the only place that we use it.

dmitry-ilyashevich/forem,nruth/forem,szymon-przybyl/forem,substantial/forem,caffo/forem,nruth/forem,frankel/forem,substantial/forem,szymon-przybyl/forem,frankel/forem,dmitry-ilyashevich/forem,caffo/forem