Update to use the latest ReSpec template

* Use latest ReSpec script
* Move contributor names from script to the document
* Add myself to contributor list
* Remove custom JavaScript
* Remove unnecessary section IDs
* Use ReSpec syntax for definitions and references to defined terms
* Remove parameter tables that duplicate the WebIDL
* Remove constructors sections, which otherwise would
   now have been empty
* Use capital MUST consistently
* Add GitHub Actions script to tidy the source document

.github/workflows/tidy.yml

@@ -0,0 +1,21 @@
+name: Tidy document
+on:
+  workflow_dispatch: {}
+  push:
+    branches:
+      - main
+
+jobs:
+  tidy:
+    name: Tidy up
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: brew install tidy-html5
+      - run: tidy -config tidyconfig.txt -o encrypted-media-respec.html encrypted-media-respec.html
+      - uses: peter-evans/create-pull-request@v6
+        with:
+          title: "Tidied up document using tidy-html5"
+          commit-message: "chore: tidy up index.html"
+          branch: html-tidy
+

W3CTRMANIFEST

@@ -1,4 +1,3 @@
 encrypted-media-respec.html?specStatus=WD;shortName=encrypted-media;useExperimentalStyles=false respec
 stack_overview.svg
 eme.css
-encrypted-media.js