Enable auto-publication of the spec to /TR

This update enables auto-publication of the spec as Candidate Recommendation
Draft to /TR, as agreed by the working group. It leverages the
[spec-prod action](https://github.com/w3c/spec-prod/) to do that.

This update also adjusts the workflow for the Editor's Draft itself. The source
spec is now to be found in the `main` branch, and instead of publishing the
source spec to GitHub Pages directly, the spec-prod action will rather deploy
the generated spec. Among other things, this makes it possible to integrate
the spec in Bikeshed's database for cross-referencing purpose (fixing w3c#137).

The spec-prod action also takes care of running ReSpec on pull requests to
validate changes from an editorial perspective.

Note the `ECHIDNA_TOKEN` was added as secret to the repository.

.github/workflows/auto-publish.yml

@@ -0,0 +1,18 @@
+name: Build, Validate, Deploy and Publish
+on:
+  pull_request: {}
+  push:
+    branches: [main]
+jobs:
+  main:
+    name: Build and validate spec, then deploy and publish (only if push to main branch)
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: w3c/spec-prod@v2
+        with:
+          GH_PAGES_BRANCH: gh-pages
+          W3C_ECHIDNA_TOKEN: ${{ secrets.ECHIDNA_TOKEN }}
+          W3C_WG_DECISION_URL: https://lists.w3.org/Archives/Public/public-secondscreen/2022Apr/0007.html
+          W3C_BUILD_OVERRIDE: |
+            specStatus: CRD

index.html

@@ -37,15 +37,6 @@
         // previousMaturity: 'WD',
         // previousPublishDate: '2015-11-02',
         otherLinks: [
-          {
-            key: 'Version history',
-            data: [
-              {
-                value: 'GitHub w3c/remote-playback/commits',
-                href: 'https://github.com/w3c/remote-playback/commits/'
-              }
-            ]
-          },
           {
             key: 'Test suite',
             data: [
@@ -58,30 +49,10 @@
                 href: 'https://w3c-test.org/remote-playback/'
               }
             ]
-          },
-          {
-            key: 'Participate',
-            data: [
-              {
-                value: 'GitHub w3c/remote-playback',
-                href: 'https://github.com/w3c/remote-playback/'
-              },
-              {
-                value: 'File an issue',
-                href: 'https://github.com/w3c/remote-playback/issues/new'
-              },
-              {
-                value: 'Open issues',
-                href: 'https://github.com/w3c/remote-playback/issues/'
-              },
-              {
-                value: 'Mailing-list (public-secondscreen@w3.org)',
-                href: 'https://lists.w3.org/Archives/Public/public-secondscreen/'
-              }
-            ]
           }
         ],
         group: 'secondscreen',
+        github: 'https://github.com/w3c/remote-playback',
         implementationReportURI: 'https://www.w3.org/wiki/Second_Screen/Implementation_Status#Remote_Playback_API'
       };
     </script>