🚀 Post: Update View

[paOmer]

Add the ability for a user to edit a post.
Make sure the user is the post author.

Notice that a post could also be a job-offer which requires creating a preference model,
so consider not allowing for a user to edit a non job-offer post to be a job-offer at first and only address it in a future issue and PR.
Another suggestion will be to only allow to edit the title and content of a post at first, and creating a new Issue regarding editing the other fields of a post.