Changed the shape of pads for U1 and U3, trying to avoid having too much solder paste.

Missed a commit, oops.

If we issue a short write, libwebsocket handles it kinda ungracefully and we have no idea when to close the socket. Instead of letting libwebsocket copy our content into a temporary buffer, we can just give it smaller pieces.

New READMEs for the examples, and update everything for the new layoutful naming convention.