This is totally unrelated, but –
Wookieepedia is the only lore site that makes sense to be written in the past tense. The stories take place a long time ago, after all.
In contrast, I hate the Forgotten Realms wiki. There’s no good reason for entries there to be written in the past tense. Grr.
No, that would be obnoxious. I would just have it all in the present tense. If you’re reading a page that was applicable in 3.5 but not 5e, just have a banner indicating the version it applies to. The Dwarf Fortress wiki does this and it’s clear to anyone reading.