add kernel/.gitignore

hc

2024-08-16 a24a44ff9ca902811b99aa9663d697cf452e08ef

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# Locally computed:
sha256  888ffd30b7e192381e2f6a948ca04669fdcc2ccc2ba016de00d38c8e30793323  bootstrap-4.3.1-dist.zip
sha256  35fbb6dc3891aacaf1ffa07abec2344fdbc454aab533a2a03bcf93577eb7837b  css/bootstrap.css