Event Report Policy: Add headers, reorganize structure, add crosslinks
    
    This is a small iteration on @bt0dotninja's work on the Event Report
    Policy. I made the following changes:
    
    * Split each group of consequences into headers
    * Move "Re-establish project activity" into its own section
    * Add page links/anchors for "Re-establish project activity"
    * Add a xref link to "Advocate Program" page
    
    Signed-off-by: Justin W. Flory <git@jwf.io>