Replace hyperlink tag with button tag in tic-tac-toe tutorial and update related references in the tutorial document

[pyitphyoaung]

…ate related references in the tutorial document

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3. If you've changed APIs, update the documentation.
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[bvaughn]

This looks good! 😄

[gaearon]

@bvaughn We'll need to update all codepens now, right?

[gaearon]

These look confusing as buttons:

We should also update their labels. For example

• Go to game start
• Go to move Run each test in its own <iframe> #1

etc

[gaearon]

I'll do that.

[gaearon]

Done. :-)

[bvaughn]

Yeah 😁 I tagged you on the parent PR about this

[bvaughn]

You rock! 🎸

[pyitphyoaung]

Yay! Cheers, guys! 😄