discussion#555 should be made to look like it's no longer active, with more blatant link to current "project"16

Originally posted by @TallTed in https://github.com/solid/specification/pull/633#pullrequestreview-1920706382

Note that #555 still looks alive. Someone coming back to it, to see the latest addition to the bottom of the table, won't necessarily see the top-posted notice that it's been closed with new info being posted at https://github.com/orgs/solid/projects/16. I suggest adding <strike> or similar markup to make clear what is no longer valid.

Also note that https://github.com/orgs/solid/projects/16 requires more thinking, parsing the date column which is no longer in ISO-numerics, figuring out that "status — done" means the meeting has been held... and now, it's even more challenging, because the last dated entry is (was) March 5 (which is now in the past) and shows status "discussed" instead of "done" or at least "scheduled" which seem to make more sense for a date in the past....

attn @csarven @VirginiaBalseiro

Start with discussion #555 and inspect its current closed notice and table presentation. Compare it with project 16, then make the obsolete content visibly inactive and add a prominent link to the current project; done means a returning reader can immediately understand that #555 is no longer active and where current information lives.