Re-organize "Articles" category in Docs site #71
Description
Currently there's a weird "catch all" category in the docs site called "Articles" which contains a smattering of articles for other categories.
We should move those articles and sort them out.
- Release Notes should either be hidden or kept updated. Currently hasn't been updated since June last year
- A lot of these (AI Usage, Biconomy, Liquidity) should be added to a new "Behind the Scenes" section
- The "season" and "league evolution" stuff should be added to the "Tournaments" section, and the "Tournaments" section should be renamed to "Seasons" or something to that effect.