This creates a custom dartdoc tool that will generate snippet blocks in our API docs that allow the user to copy easily to the clipboard, and will also embed the snippet code into a template to show it in a larger context with an app.
This PR adds the snippet tool, a template, and a couple of HTML skeleton files, one for snippets that are designed to be in an application setting, and one where it simply puts a nice container around existing snippets, making them easier to copy to the clipboard.
This consolidates all of the non-template .gitignore rules into the top level .gitignore, to ignore common things more broadly, with less maintenance needed for the .gitignore files. Does not touch the templates, so that they still produce needed .gitignores as part of flutter create.
* update the color and logo for the docs site
* update the color and logo for the docs site
* remove unused file
* removed unused script code
* tweak styles for inherited names
* configs for firebase hosting
* use the implicit FIREBASE_TOKEN
* don't print every command (lowers the chance of printing secret env vars, and for realz only deploy when merging into master
* add a webmaster tools verification file
* also put the verification file at the root of our bucket
* add comment for when we can simplify this script
* 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
