Day 2: made this navigation menu consistent across days

Created this boilerplate code that I can then include in each day's project, on top
so at least there's _some_ sort of consistency :)

but since I haven't done much else, I thought of displaying your computer's IP Address:
172.70.50.17

Here's what else a website might find out from your browser:
- the User Agent string. Basically - what browser you're using:
CCBot/2.0 (https://commoncrawl.org/faq/)