rename template new_post to posts_new
fix text areas in template posts_new
rename posts route to posts index route
rename posts view to posts index view
create posts new view
move content of template posts to new template posts_index and replace it with an outlet
make the routes for post show pages and new posts nested routes
adapt the copied posts_new_controller further to the project
add alternative functionality to posts_new_route
comment out own new post from code and copy and adapt code from example