WIP: Tags commits

Ability to view tags on the welcome page has been implemented. The seed file was used to populate the tags. We still need to implement CRUD functionality for tags (create, edit, destroy). We can view the tags by clicking on them, which should populate a list of questions which have tag_ids. However, the relationships are currently wrong. We need to change the relationship of tags and questions to: many-to-many and have a join table so we can access questions related to a tag. That is the next step.