Fix two pubrules errors: metadata and an editor outside the TAG (#28)

Author: jyasskin

.github/workflows/build.yml

@@ -20,3 +20,4 @@ jobs:
           W3C_BUILD_OVERRIDE: |
             status: NOTE
             metadata order: *, !*
+            metadata include: Participate no, Feedback yes

index.bs

@@ -7,9 +7,9 @@ Group: tag
 Repository: w3ctag/explainer-explainer
 URL: https://w3ctag.github.io/explainer-explainer/
 TR: https://www.w3.org/TR/explainer-explainer/
-Editor: Daniel Appelquist, w3cid 35086, Invited Expert
 Editor: Matthew Tylee Atkinson, w3cid 68793, Samsung https://www.samsung.com
 Editor: Jeffrey Yasskin, w3cid 72192, Google https://google.com, [email protected]
+Former Editor: Daniel Appelquist, w3cid 35086, Invited Expert
 Complain About: accidental-2119 yes, missing-example-ids yes
 Markup Shorthands: markdown yes, css no
 Assume Explicit For: yes