Improve brand awareness for make your UNO kit

[chingyenyang]

What This PR Changes

• the changes for button and the add of some extra information on the web page to make it clearer for users: instruction link & component list.
• Also, make the practical information clearer on the web page in order to make users easily aware of the instruction information. This will further improve the brand awaress.
• solves makeyouruno.arduino.cc is not easily accessible from the Make Your Uno Docs page #1765

Contribution Guidelines

• [ x] I confirm that I have read the contribution guidelines and comply with them.

[CLAassistant]

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[jhansson-ard]

Hello @chingyenyang!

Thank you for your PR, however we cannot approve this since we handle brand awareness internally with the Arduino Team.

We will take a look at your open issue and see if we can find a solution.

Have a great day! ⭐