* emails: use an https image for the logo
Some mail clients do not like http images.
* emails: use an https:// link for "getting started"
* email: doc.grafana.com for Getting Started link
review suggestions from https://github.com/grafana/grafana/pull/25957
Co-authored-by: Sofia Papagiannaki <papagian@users.noreply.github.com>
Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>
Co-authored-by: Sofia Papagiannaki <papagian@users.noreply.github.com>