[HTML5] Add jsdoc2rst tool.

A template for `jsdoc` that generat the HTML5 public classref.

The script can be run via `npm run docs` to print to stdout.

You can dry run via `npm run docs -- --d dry-run` or write to file via
`npm run docs -- -d /path/to/file.rst`

Also update Makefile in `doc/` and add dry run test to CI.

(cherry picked from commit 472482013e)

doc/Makefile

@@ -2,6 +2,7 @@ BASEDIR = $(CURDIR)
 CLASSES = $(BASEDIR)/classes/ $(BASEDIR)/../modules/
 OUTPUTDIR = $(BASEDIR)/_build
 TOOLSDIR = $(BASEDIR)/tools
+JSDIR = $(BASEDIR)/../platform/javascript
 
 .ONESHELL:
 
@@ -23,6 +24,10 @@ markdown:
 rst:
 	rm -rf $(OUTPUTDIR)/rst
 	mkdir -p $(OUTPUTDIR)/rst
-	pushd $(OUTPUTDIR)/rst
-	python3 $(TOOLSDIR)/makerst.py $(CLASSES)
-	popd
+	python3 $(TOOLSDIR)/makerst.py -o $(OUTPUTDIR)/rst $(CLASSES)
+
+rstjs:
+	rm -rf $(OUTPUTDIR)/rstjs
+	mkdir -p $(OUTPUTDIR)/rstjs
+	npm --prefix $(JSDIR) ci
+	npm --prefix $(JSDIR) run docs -- --destination $(OUTPUTDIR)/rstjs/html5_shell_classref.rst