Add dashboard page

[neatonk]

Requirements

• [x] Project listing for current user including: project name, description, and last update timestamp.
• [x] Includes all projects on which the user is a collaborator, including projects they created or were added to.
• [x] Sorted in reverse chronological order with the most recently updated projects first.
• [x] Click project name to view project page.
• [x] New project button, which creates a project and takes the user to it.
  • [x] Project splits default to 100% for project creator.
• [x] Prompt user to create a new project if there are none to list.

TODO

• [x] Insert new row in projects table when "New Project" button is clicked.
• [x] List projects dashboard and link to each project page.