Integrate meta-guf-machine/cherry-pick-1ab3758a

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Commit: https://git.seco.com/seco-ne/yocto/layers/meta-guf-machine/-/commit/1c854b1415a4259edf1c182b3c7b8d0b6cfb4eba

readme: Update and clean-up

- Updated old infos
- Renamed G&F to SECO North
- Updated URLs
- Fixed some spelling errors


(cherry picked from commit 1ab3758ae59ab4a6593aa17d7726c27bff60042f)