hpc-authentication options

[jessb0t]

Need to understand required/preferred methods for authentication when using the HPC. For instance: SSH, personal access token, etc.

DONE Defined:

• Guidance received from IRCC group.
• Guidance tested.
• Authentication instructions added to hpc wiki page.

[F-said]

Pulling info from onboarding slides onto hpc documentation page branch. Will close issue once merged in.