File www/checkin.wiki artifact 66dd43d52c part of check-in 831306e11b

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Checkin Checklist

Before every checkins:

1. fossil diff →
   1. No stray changes
   2. All inputs are scrubbed before use
   3. No injection attacks via %s formats

2. fossil extra → no unmanaged files need to be added.

3. The checkin will go onto the desired branch.

4. The checkin will not cause a unintentional fork.

Before every checkin to trunk:

5. No compiler warnings on the development machine.

6. The fossil executable that results from a build actually works.