Fix raw content links in local deployment of sample service

[sjanota]

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Description

Changes proposed in this pull request:

• our examples are using httpa://github.com/raw to access raw files on github. This is not working and recommended way is to use https://raw.githubusercontent.com. For example old link https://github.com/raw/kyma-project/examples/master/http-db-service/deployment/deployment.yaml leads to non existing page, while new one https://raw.githubusercontent.com/kyma-project/examples/master/http-db-service/deployment/deployment.yaml works perfectly fine

Issue link