adds new view, route, controller function, link to new from index
adds form for inputting new post
adds changes to tags views, routes, controller
Revert "adds form for inputting new post"

This reverts commit 627a41f0468536b8e4380320d9d11cdd1e42f5de.

got rid of tag controller changes etc
adds show view for posts, adds route, adds controller fcn