Update text and diagram around restoration

Author: XAMPPRocky

resources/project-group-workflow.png

@@ -46,7 +46,7 @@ as certain project or effort in the Rust team.
 This is a high level overview of the complete process of a project group.
 
 <p align="center">
-    <img src="../resources/project-group-workflow.png"
+    <img src="../resources/project-group-workflow.svg"
         alt="A flow diagram showing each step of a project group"
         height="800px">
     <p align="center">Figure 1. Project Group Lifecycle</p>
@@ -93,10 +93,12 @@ This is a high level overview of the complete process of a project group.
 5. The group works towards the goals laid out in their charter.
 
 6. When active work has stopped a group is "archived".
-- Archival can be started by the project group shepherds, the liasion, or the lead(s) of
-  the parent team if needed.
-- Archival is not necessarily a permanent state, it is only a reflection on the current
-  status of the group. A group can be "restored" at a later stage.
+- Archival can be started by the project group shepherds, the liasion, or the
+  lead(s) of the parent team if needed.
+- Archival is not necessarily a permanent state, it is only a reflection on the
+  current status of the group.
+  - Similarly a groups archival doesn't imply that work in that area has been
+    exhausted
 - Reasons to archive (non-exhaustive):
   - Nobody in the group has time anymore or higher priority things arose.
   - There's a blocking issue that can't be resolved.
@@ -117,15 +119,6 @@ This is a high level overview of the complete process of a project group.
 - Archive GitHub repository to be read-only.
 - Archive chat channel(s) on any platforms.
 
-9. (Optional) Restore group
-
-- At any later point the group could be restored to active status if there's
-  interest among the team to revive the effort.
-- If significant time has passed, part of restoring the group should be to
-  evaluate whether the past decisions and rationale are still applicable to the
-  present.
-- Go to step 2.
-
 [`rust-lang/team`]: https://github.com/rust-lang/team
 [internals]: https://internals.rust-lang.org