Updates to main FM page for WS/WC info

Why is this change being made?

Updates to this Page:

• Replaced the current workshop section with a link to our new webcast/workshop FM page (all information that was included in this section originally has been moved to the new page so it was not lost).
• Updates to the tactic details/template/epic code section of the page with new links for WC/WS
• Updates to the new SFDC campaign/Marketo program page as well in this MR and to Virtual Events page in this MR for reference

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
• Assign this change to the correct DRI
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to your manager.
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
  • If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping @gl-static-site-editor in a comment for a review and merge. For example changes to .gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files.