remove references to nexus #1687

Job	Run time
Run Cargo Deny (advisories)	39s
Check if committed README is the one we would render from the available parts	24s
Check if committed Helm charts are up to date	37s
Run Cargo Deny (bans licenses sources)	45s
Run Clippy	26s
Run RustDoc	1m 13s
Run Rustfmt	17s
Run Cargo Tests	27s
Run Cargo Udeps	1m 36s
Select target helm repository based on action trigger	1s
All tests passed	1s
Package Charts, Build Docker Image and publish them - ubuntu-latest	11m 19s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	10m 5s
Build and publish manifest list	35s
Run the OpenShift Preflight check on the published images	14s
	28m 39s

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