docs: drop soon to be outdated UI image for now

README.md

@@ -7,8 +7,6 @@
 A terminal client for metadata resistant messaging built on the [Cwtch
 protocol](https://docs.openprivacy.ca/cwtch-security-handbook/overview.html#what-is-cwtch).
 
-<p align="center"> <img src="./docs/pre-alpha-ui.png"> </p>
-
 This is a **pre-alpha prototype** and an *unofficial* community implementation
 which is currently only ready for experimentation and testing. Please *do not*
 use existing [`cwtch-ui`](https://cwtch.im/download/) profiles with `cairde`!