Update instructions to suggest go install rather than go build for building plugins
Make instructions for installing go dependencies consistent
See comment here: https://gitlab.com/gitlab-org/fleeting/fleeting-plugin-aws/-/issues/2#note_1230792231
Make instructions for installing go dependencies consistent
See comment here: https://gitlab.com/gitlab-org/fleeting/fleeting-plugin-aws/-/issues/2#note_1230792231