Generate Rules.md and md###.md files from metadata, improve Parameters documentation by referencing schema.

doc/md043.md

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+# MD043 - Required heading structure
+
+Tags: headers, headings
+
+Aliases: required-headers, required-headings
+
+Parameters:
+
+* `headers`: List of headings (`string[]`, default `[]`)
+* `headings`: List of headings (`string[]`, default `[]`)
+* `match_case`: Match case of headings (`boolean`, default `false`)
+
+> If `headings` is not provided, `headers` (deprecated) will be used.
+
+This rule is triggered when the headings in a file do not match the array of
+headings passed to the rule. It can be used to enforce a standard heading
+structure for a set of files.
+
+To require exactly the following structure:
+
+```markdown
+# Head
+## Item
+### Detail
+```
+
+Set the `headings` parameter to:
+
+```json
+[
+    "# Head",
+    "## Item",
+    "### Detail"
+]
+```
+
+To allow optional headings as with the following structure:
+
+```markdown
+# Head
+## Item
+### Detail (optional)
+## Foot
+### Notes (optional)
+```
+
+Use the special value `"*"` meaning "zero or more unspecified headings" or the
+special value `"+"` meaning "one or more unspecified headings" and set the
+`headings` parameter to:
+
+```json
+[
+    "# Head",
+    "## Item",
+    "*",
+    "## Foot",
+    "*"
+]
+```
+
+When an error is detected, this rule outputs the line number of the first
+problematic heading (otherwise, it outputs the last line number of the file).
+
+Note that while the `headings` parameter uses the "## Text" ATX heading style for
+simplicity, a file may use any supported heading style.
+
+By default, the case of headings in the document is not required to match that of
+`headings`. To require that case match exactly, set the `match_case` parameter to
+`true`.
+
+Rationale: Projects may wish to enforce a consistent document structure across
+a set of similar content.