[Tutorial] Make it easier to follow the instructions (#9454)

* tutorial: adds note about onClick

* tutorial: show full square component

* merge

* fixes line number

* tutorial: misc changes

* fixes Board render initial code sample

* [tutorial] adds codepen links and misc small fixes

* removes useless arrow functions, #9531

* {this.renderSquare} new lines

* be more explicit about history state

* fixes highlight

* following along locally

* changes todo to this.props.value

* removes calculateWinner from initial codepens and includes it in tutorial

* removes note about calculateWinner at end of file

* adds debug-view and debug-view-final

* removes debug view, updates codepen instructions

* adds another codepen

* tutorial.md

* tutorial.md

* tutorial.md

* tutorial.md

* Put . into links for consistency with docs

* Make the very first change easier to follow

* A few more changes

(cherry picked from commit e9d6f3f10e)

docs/Gemfile.lock

@@ -65,6 +65,3 @@ DEPENDENCIES
   rb-fsevent
   redcarpet
   sanitize (~> 2.0)
-
-BUNDLED WITH
-   1.11.2