consider writing an account migration guide

Here are my notes based on recent experience: https://matrix.to/#/!PiXW7bFSFwWEWnO5idsQ901R5jB2t-n6_gr9agfUgKE/$xUbeooOlb6UIiWIihtkpCBVT3_3u2xs5jhVfG1PRM6Q?via=matrix.org&via=janian.de&via=element.io

Start by reading the notes in the linked Matrix discussion to identify the account-migration steps and intended audience. The work is done when those steps are organized into a published migration guide for matrix.org; the issue names no target file or existing documentation entry point.

Written by the indexing model from the issue text.