[coreboot-gerrit] Change in coreboot[master]: util/hugo: Add `serve` target for hugo's builtin webserver

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Change subject: util/hugo: Add `serve` target for hugo's builtin webserver
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/59100/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/14435/ : SUCCESS