Rename config.proto for better discoverability

[jpeach]

In the Kuma repository, the import path for config.proto is simply:

import "config.proto";

This is very confusing because there's no obvious relationship between the doc option and a file named config.proto, and the Kuma repository already has 2 different config.proto files.

This would be much more obvious if we could make the import thus:

import "kumadoc/doc.proto";

[jpeach]

ping @bartsmykla

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[github-actions]

This issue was inactive for 30 days it will be reviewed in the next triage meeting and might be closed.
If you think this issue is still relevant please comment on it promptly or attend the next triage meeting.