[whatwg/encoding] Visualization tables has lack of descriptions (Issue #292)

1. It is unclear how to read "BMP coverage". It would be worth having a few introductory words on the page about what it is
2. Some of shown information is not clear and not described anywhere, for example, numbers in the bottom of each cell:
![Big5-bmp](https://user-images.githubusercontent.com/450131/185782258-31f390e7-9bd4-412b-9bd1-52463ad87847.png)
https://encoding.spec.whatwg.org/big5-bmp.html
3. Colormap (Legend) is better to include to the page with table itself, and also add a tooltips to each cell with the info from legend
4. Why it is generally important to encode information like "Two bytes in UTF-8, _code point follows immediately the code point of previous pointer_" in the color? What's so important about "follows immediately" that it has it's own color?
5. "BMP coverage" table and the other table has different cell layout: codepoint in "BMP coverage" is above the symbol and unknown number is below, the other table is opposite; a number (looks like a cell number here, but it is not a cell number in BMP) is shown in all cells in other table, but only in mapped cells in "BMP coverage"
6. Why in the other table cell coordinates starts not from zero? What that numbers mean?
![Big5](https://user-images.githubusercontent.com/450131/185782940-f2851f00-f00a-44fd-bad7-7978abfdc75b.png)
https://encoding.spec.whatwg.org/big5.html

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