make separate dev/stable channels #1

i should've probably started with a stable branch instead of the default master - it's a bit too late now.

so, mention explicitely that master branch is the prod/stable channel and create a dev branch. describe how updates get from the dev into master.

i should've probably started with a `stable` branch instead of the default `master` - it's a bit too late now. so, mention explicitely that `master` branch is the prod/stable channel and create a `dev` branch. describe how updates get from the dev into master.

partially done in 35f87341e6. just need to write it down in readme.

partially done in https://git.qcode.ch/nakamochi/sysupdates/commit/35f87341e6e110a15efda770e886a981259ae651. just need to write it down in readme.

moved to https://github.com/nakamochi/sysupdates/issues/5

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make separate dev/stable channels #1