Update README

Add theory of operation

WIP: experimental dynamic refresh

Slow down debugger comunication

Current PCB revision doesn't handle fast debug communication well.

Fix vw_rx_buf overflow

Fixes: https://todo.sr.ht/~krystianch/tiny-weather/8

Update picture

Add receiver enclosure

Update VirtualWire implementation

Fix missing border argument

Fix silkscreen overlaps

Fix receiver silkscreen

Add transmitter gitignore

Add BOM picture

Add DC jack bypass jumper

Add gerbers and built 3d models to gitignore

Make RF Rx footprint fit all 3 RF modules

Fix variable name

Add size checking

Add rectangle drawing function

Add border refresh control