Sam/migration waves (#283)

* chore: updated 'move group' nomenclature to 'migration wave' in export guide

* chore: updated 'move group' nomenclature to 'migration wave' in 'get several' guide

* feat: added migration wave guide

* chore: update sidebar

* fix: fixed self-closing tags

* fixup! fix: fixed self-closing tags

* fix: added additional explainer sentance about multi-wave toggle

* feat: added more detail to the migration planner section

* chore: fix list formatting

Author: SamDesmondKing

_data/sidebars/main_sidebar.yml

@@ -104,10 +104,13 @@ entries:
       - title: Plan
         output: web
         folderitems:
-          - title: Getting Apps and Resources within your Move Group
+          - title: Migration Waves
+            output: web
+            url: /migration-waves.html
+          - title: Getting Apps and Resources within your Migration Wave
             output: web
             url: /get-all-move-groups.html
-          - title: Exporting Servers from Move Groups
+          - title: Exporting Servers from Migration Waves
             output: web
             url: /exporting-servers-to-csv.html
           - title: Integrating with Jira