Chore: merge all html formatter files into html.js

[mdjermanovic]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[x] Other, please explain:

We encountered the following problem during the release.

The gensite script reads the content of ./lib/cli-engine/formatters/

eslint/Makefile.js

Line 413 in 9e9b5e0

const formatterFiles = fs.readdirSync("./lib/cli-engine/formatters/"),

and then uses all found .js files as formatters, in order to generate https://eslint.org/docs/user-guide/formatters/ page

eslint/Makefile.js

Lines 443 to 451 in 9e9b5e0

	return formatterFiles.reduce((data, filename) => {
	const fileExt = path.extname(filename),
	name = path.basename(filename, fileExt);
	if (fileExt === ".js") {
	const formattedOutput = cli.getFormatter(name)(
	rawMessages.results,
	{ rulesMeta }
	);

The problem is that after #14287, that directory contains .js helper files for the html formatter, but those helper files are not formatters.

What changes did you make? (Give an overview)

Merged all html-*.js files into the main html.js.

Is there anything you'd like reviewers to focus on?

[btmills]

Let's see if this does the trick

[mdjermanovic]

Thanks!