improve readability by hiding superfluous information behind details tags. Also change h1 to h2 - there should be only one h1 on a page
improve formatting
Updated 1846 (markdown)
Clarified that the link is to GMT First Edition Rules, since it could be argued that the actual first edition was Deep Thought Games publication.
didn't mean to publish the previous version before PR #5425 is released
Point to the final 2-player variant rules, as approved by Tom Lehmann