add a dev/dartdoc.dart script to generate docs for the packages/ packages

* add a dev/dartdoc.dart script to generate docs for the packages/ packages

* remove description

* rename readme

* change to using --include-external

* move docs to dev/docs
diff --git a/dev/docs/.analysis_options b/dev/docs/.analysis_options
new file mode 100644
index 0000000..8e12348
--- /dev/null
+++ b/dev/docs/.analysis_options
@@ -0,0 +1,3 @@
+analyzer:
+  exclude:
+    - 'lib/**'