Improve MWEB documentation

[uwuforever]

I'd like to build in MWEB support on some of my tools, but I'm noticing that a lot of the docs seem outdated. For example, the link for LIP-0005, which other pages mention as describing data serialization, is entirely dead. Is there anywhere I can get reliable documentation/test vectors? If not available at the moment, could I get clarification on how a peg-in transaction works?

I'm trying to set it up so that users without a full node can be given a kernel commitment script to pay to instead, like [ltc1ffy0qvmhg9rfh38f2lpnenjy9wnmdv33ces37amxkzq3qmkwz8sssm68cr7](https://blockchair.com/litecoin/address/ltc1ffy0qvmhg9rfh38f2lpnenjy9wnmdv33ces37amxkzq3qmkwz8sssm68cr7). Currently I'm going off the assumption that the longer getrawtransaction output, before it gets cut-through at 6 confirms, is the full transaction format that would have to be sent, and I'm trying to pull it apart. But the behavior I see on testnet transactions doesn't quite match the docs - as an example, https://github.com/litecoin-project/lips/blob/master/lip-0003.mediawiki suggests there should only be a single EB output, but all peg-in transactions seem to have 2.

Current progress: serialization.txt