Add mobile friendly layout

[pmpinto]

Closes #1251

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This reworks the tablerow.html include file so that:

• Images aren't squished;
• Product names are slightly bigger;
• Model numbers are slightly smaller;
• Product names, model numbers and compatibility icons appear on top of each other, and…
• … images take up 3 rows so that they align with the product details;
• It can now be included everywhere by default and the compatibility icons get hidden if the hide_compat variable is present (⚠️ This means the tablerow_nocompatibility.html file should now be safe to delete. I didn't, but feel free to ask for it.)

This PR will also fix the non-scrolling mobile navigation.
And will also allow more vertical space for the affiliate disclaimer text in the navigation on large layouts — it was partially hidden.
Lastly, it replaces the non-existent HTML element sidebar with nav which represents a navigation.

@blakadder please take a look at this when you can and let me know if you would like some tweaking.