Add social links

todo.txt

@@ -1,10 +0,0 @@
-- https://github.com/Vanilagy/mp4-muxer/issues/83 tell him it's possible now
-- textsubtitlesource, chunked piping
-- More efficient MP3 loading when reading sequentially
-- Redo readers: I think better to have a single reader with ephemeral/non-ephemeral loading methods than to have multiple readers. This way, they can still share data.
-- Readers: Does it make more sense to have `pos` handled outside? Otherwise it's ripe for async race conditions.
-
-For release:
-- Write README
-- Migration guides on old repos & deprecation
-- llms.txt???