See https://docs.flutter.io/ to see what I mean.

* Update dartdoc to v0.18.1 and fix API readme, borrowing from docs.flutter.io

* Fixed typo in navigator.dart doc comments

* Added survey js to docs template

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 docs css style so the generated dartdoc matches the new flutter.io

* Change to 0.12.0 dartdoc

* Review comment

Fixes https://github.com/flutter/flutter/issues/9377

* update the font used for docs.flutter.io

* update to use the flutter primary color

* update the header background color

Fixes https://github.com/flutter/flutter/issues/7963

* 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

* put an index at root of API docs bucket

* ignore all of dev/docs/doc dir, fix a bug, remove private names from doc gen script

* tweaks from review

* 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

* find all repo packages

* .dartignore

* styles updates for the api docs

* update library docs

* use the new --favion and --use-categories options for dartdoc

* some docs cleanup

* update styles

* remove unused file

* 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