docs(README): move to .rst extension

4 jobs for topic/default/readme.rst in 1 minute and 40 seconds (queued for 21 seconds)
Status Job ID Name Coverage
  Test
passed #62390
check-manifest

00:00:25

passed #62391
flake8

00:00:24

passed #62392
py3

00:01:39

passed #62393
safety

00:00:52