Remove names from snapshots

[snoyberg]

It doesn't seem to match our overall approach to other config files.
Instead of giving a user-friendly name, I've modified the one place that
was displaying the name to instead display the location of the snapshot.

Note: Documentation fixes for https://docs.haskellstack.org/en/stable/ should target the "stable" branch, not master.

Please include the following checklist in your PR:

• Any changes that could be relevant to users have been recorded in the ChangeLog.md
• The documentation has been updated, if necessary.

Please also shortly describe how you tested your change. Bonus points for added tests!

[qrilka]

LGTM but what about fixing curator? (CI hinted about those)

[snoyberg]

My mistake, thanks for pinging me.