maint/dev ~ update Remark markdown-linting configuration and plugins

.remarkrc.js

@@ -0,0 +1,28 @@
+// spell-checker:ignore frontmatter retext
+exports.plugins = [
+	require('remark-footnotes'),
+	// require('remark-frontmatter'),
+	[
+		require('remark-retext'),
+		require('unified')().use({
+			plugins: [
+				require('retext-english'),
+				require('retext-syntax-urls'),
+				// [require('retext-spell'), require('dictionary-en')],
+				[require('retext-sentence-spacing'), { preferred: 1 }],
+				require('retext-repeated-words'),
+				require('retext-passive'),
+			],
+		}),
+	],
+	'remark-preset-lint-consistent',
+	'remark-preset-lint-recommended',
+	'remark-preset-lint-markdown-style-guide',
+	['remark-lint-emphasis-marker', 'consistent'],
+	['remark-lint-file-extension', false],
+	['remark-lint-heading-increment', false],
+	['remark-lint-list-item-indent', 'mixed'],
+	['remark-lint-maximum-line-length', false],
+	['remark-lint-no-duplicate-headings', false],
+	['remark-lint-unordered-list-marker-style', 'consistent'],
+];

package.json

@@ -177,14 +177,23 @@
 		"prettier": "^2.1.1",
 		"remark-cli": "^9.0.0",
 		"remark-footnotes": "^3.0.0",
+		"remark-preset-lint-consistent": "^4.0.0",
+		"remark-preset-lint-markdown-style-guide": "^4.0.0",
 		"remark-preset-lint-recommended": "^5.0.0",
+		"remark-retext": "^4.0.0",
+		"retext-english": "^3.0.4",
+		"retext-passive": "^3.0.0",
+		"retext-repeated-words": "^3.0.0",
+		"retext-sentence-spacing": "^4.0.0",
+		"retext-syntax-urls": "^2.0.0",
 		"rimraf": "^3.0.2",
 		"rollup": "^2.36.1",
 		"rollup-plugin-typescript2": "^0.29.0",
 		"shx": "^0.3.3",
 		"ts-node": "^9.0.0",
 		"tsd": "^0.14.0",
-		"typescript": "^4.1.3"
+		"typescript": "^4.1.3",
+		"unified": "^9.2.0"
 	},
 	"optionalDependencies": {},
 	"ava": {