Adding quick web serial terminal.

site/BUILD

@@ -24,6 +24,7 @@ DEPLOY_ITEMS = []
 DEPLOY_ITEMS += [
   Copy('$dst/deploy/.gcloudignore', '$src/site/.gcloudignore'),
   Copy('$dst/deploy/ueforth.js', '$dst/web/ueforth.js'),
+  Copy('$dst/deploy/serial.html', '$dst/web/serial.html'),
   Importation('$dst/deploy/index.html', '$src/site/index.html', options=ESP_OPTIONS),
   Importation('$dst/deploy/linux.html', '$src/site/linux.html', options=UE_OPTIONS),
   Importation('$dst/deploy/windows.html', '$src/site/windows.html', options=UE_OPTIONS),

site/app.yaml

@@ -37,6 +37,11 @@ handlers:
   upload: (.*).html
   secure: always
 
+- url: /serial
+  static_files: serial.html
+  upload: serial.html
+  secure: always
+
 - url: /(.*).js
   static_files: \1.js
   upload: (.*).js