import from wiki

[wsor4035]

some of these pages do have mtg content, but as they are engine constructs, worth bringing over

[mark-wiemer]

Works on #15

[grorp]

If you import new MTG content, please add it to the todo list in #80

(and preferably, do a pass over the text to remove the obvious MTG stuff when importing I see this was kinda discussed before at https://irc.minetest.net/minetest-docs/2024-12-15#i_6227127, so whatever 🤷)