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

doc/md001.md

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+# MD001 - Heading levels should only increment by one level at a time
+
+Tags: headers, headings
+
+Aliases: header-increment, heading-increment
+
+This rule is triggered when you skip heading levels in a Markdown document, for
+example:
+
+```markdown
+# Heading 1
+
+### Heading 3
+
+We skipped out a 2nd level heading in this document
+```
+
+When using multiple heading levels, nested headings should increase by only one
+level at a time:
+
+```markdown
+# Heading 1
+
+## Heading 2
+
+### Heading 3
+
+#### Heading 4
+
+## Another Heading 2
+
+### Another Heading 3
+```
+
+Rationale: Headings represent the structure of a document and can be confusing
+when skipped - especially for accessibility scenarios. More information:
+<https://www.w3.org/WAI/tutorials/page-structure/headings/>.