adapt new versioning procedure

.gitignore

.gitlab-ci-scripts/set-prerel-version

cmd/mytoken-server/main.go

cmd/mytoken-server/mytoken-migratedb/main.go

cmd/mytoken-server/mytoken-migratedb/version.go

cmd/mytoken-server/mytoken-setup/setup.go

internal/db/dbrepo/versionrepo/versionrepo.go

internal/endpoints/configuration/configurationEndpoint.go

internal/model/version/VERSION

internal/model/version/version.go

internal/server/web/static/img/mytoken-grey.png

internal/server/web/static/img/mytoken.png

mytoken.png