Allow viewing of the CLA without authenticating.

[rwinch]

It currently requires authentication to view the CLA in order to determine if the user signed it. We should try and consider a workflow that does not require authenticating because executives without a GitHub account might need to review the CLA.

The downside to not requiring authentication is that we will display the CLA without knowing if the user should sign it or not until they logged in causing an extra step for a majority of users.

We can create two links on the landing page. The existing sign button along with a view CLA link.