[MKC-1331] MicroPython 101 Tweaks

[jacobhylen]

What This PR Changes

This PR fixes a couple oversights in the MicroPython 101 Course:

• When we've reordered tutorials within the course, we didn't change the "next chapter" links, so if you follow them the order is jumbled and incorrect.
• In the installation guide, we were listing the tools to be installed, with links. The links may seem initially like they would be a good idea, but they inherently prompt readers to click, and download. Instead, we should prefer them to wait with downloading until they get to the step by step guide later on the page, for a more intuitive flow.
• One empty link.

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[karlsoderby]

I think while we are at it, let's consider changing the top part of this tutorial. It starts with ## Goals and then goes directly in to it. There's currently no other chapter having a "Goals" section as well.

I think maybe it would best to have a gentle introduction at the very start, along the lines of:

To use MicroPython on an Arduino, we need the two following tools: - [MicroPython Firmware Installer]() - a tool that installs a specific firmware on your board, so that you can program it using MicroPython - [MicroPython Lab for Arduino]() - an editor that you can program your Arduino in (like the Arduino IDE).

Doesn't need to be exactly like ^, but some sort of intro!

[jacobhylen]

@karlsoderby How's this? :)