Added the ability for superuser or creators "remove" / hide the post from the feed

[Pdzly]

Only a superuser can restore it.

@isik-kaplan i know already i will have to rewrite a lot of things as i am not sure how to handle this correctly.

[isik-kaplan]

Awesome PR, I just have some nitpicks as always

Also I wasn't planning on removal of posts so people who bookmarked posts can always come back and see the posts they bookmarked but we can add it as a separate feature so if someone bookmarks a post it is automatically added to a hidden library so even if the original is deleted/hidden we can let them keep it in their own library

And maybe as a followup we can add a feature similar to repost detection and not allow reposts of previously hidden posts (if a superuser hid them) so less moderation is required. Not in this PR though obviously

[isik-kaplan]

Any reason for this?

[Pdzly]

Whoops sry, as i can not migrate down, i had to redo all so i did it like #7 forgot to undo this. Sry

The reason why i cant migrate down is, the user "wsd" is not available from the host machine and even if i expose the network to the public it always says password is wrong for the user wsd.

This works but it still gets a warning that the runtimewarning.
python manage.py makemigrations core
RuntimeWarning: Got an error checking a consistent migration history performed for database connection 'default': connection failed: connection to server at "127.0.0.1", port 5432 failed: FATAL: password authentication failed for user "wsd"

[Pdzly]

@isik-kaplan i am unsure as Posts will still be visibible for example in the Profile view, as that is a server component. And should i make that a client? or what would you do? or is it just ok that it would just show the user "Post not found" message there.

Added a "Hidden" flag for the superuser.

[Pdzly]

I dont know if it is a good idea to keep "hidden" posts of the users data. ( i know most things arent OC but still... could become a drama if a user wants their data gone or hidden but some bookmarked post stays. )

If you want to do it, then just ignore the is_hidden attribute = the bookmarked result.