Outdated board revision on kitspace.org revision

[Space Meyer]

I'm creating this issue mostly for documentation purposes.

The glasgow board revision on kitspace.org was pinned to revC1 in kitspace/kitspace@7e6a4e8. This seems to have been in response to some branch shenanigans according to #199 (comment).

All of this seems no longer relevant as:

• the kitspace.yml in this repo was bumped to revC3 in 5c79669 by @whitequark
• revC3 files are in the main branch now

So I propose reverting kitspace/kitspace@7e6a4e8 instead of re-pinning to revC3.

[Catherine]

LGTM