Switch to using simpler asciidoctor bytefield extension approach.

No longer depend on unreleased branches of Antora, but instead use the
just-published asciidoctor.js extension to handle bytefield blocks.

Also updated the local documentation build to enable LUNR search.

.gitignore

@@ -17,4 +17,3 @@ pom.xml.asc
 .hgignore
 .hg/
 /node_modules
-/package-lock.json

doc/README.md

@@ -18,8 +18,7 @@ fully driven by `npm`!
         npm install
 
     This will install the dependencies needed for building the
-    documentation site, including David Jenks' not-yet-merged enhancements
-    to Antora.
+    documentation site.
 
 2. Then whenever you want to build a local preview of the
    documentation site, you can run:

doc/local.yml

@@ -13,11 +13,7 @@ content:
 asciidoc:
   extensions:
   - asciidoctor-mathjax
-plugins:
-  - path: antora-generic-svg-extension-plugin
-    config:
-      generator: bytefield-svg
-      name: bytefield
+  - "@deepsymmetry/asciidoctor-bytefield"
 ui:
   bundle:
     url: https://deepsymmetry.org/media/antora/ui-bundle.zip

doc/netlify.yml

@@ -13,12 +13,7 @@ content:
 asciidoc:
   extensions:
   - asciidoctor-mathjax
-plugins:
-  - path: antora-generic-svg-extension-plugin
-    config:
-      generator: bytefield-svg
-      name: bytefield
-  - path: antora-lunr
+  - "@deepsymmetry/asciidoctor-bytefield"
 ui:
   bundle:
     url: https://deepsymmetry.org/media/antora/ui-bundle.zip