Remove the notion of "channel members."

This came out of a conversation with Kit. Their position, loosely, was that seeing scrollback when you look at a channel is useful, and since message delivery isn't meaningfully tied to membership (or at least doesn't have to be), what the hell is membership even doing? (I may have added that last part.)

My take, on top of that, is that membership increases the amount of concepts we're committed to. We don't need that commitment yet.

1 files changed, 1 insertions, 0 deletions

diff --git a/migrations/20240911230415_no_channel_membership.sql b/migrations/20240911230415_no_channel_membership.sql
new file mode 100644
index 0000000..db5a054
--- /dev/null
+++ b/migrations/20240911230415_no_channel_membership.sql
@@ -0,0 +1 @@
+drop table channel_member;