Shrink readme's MIDI device menu text

Don't need to include all of the text. It was making the readme harder
to scroll through. This also wraps that block with a sup tag, which is
meant to make the text smaller. Might remove it if it causes problems.

README.md

@@ -22,6 +22,8 @@ build/orca    # Run orca
 
 To choose your MIDI output device, press `F1` (or `Ctrl+D`) to open the main menu, and then select `MIDI Output...`
 
+<sup>
+
 ```
 ┌ ORCA ───────────────┐┌ PortMidi Device Selection ─────┐
 │   New               ││ > (*) #0 - Midi Through Port-0 │
@@ -37,16 +39,12 @@ To choose your MIDI output device, press `F1` (or `Ctrl+D`) to open the main men
 │ > MIDI Output...    │
 │                     │
 │   Clock & Timing... │
-│   Appearance...     │
-│                     │
-│   Controls...       │
-│   Operators...      │
-│   About ORCA...     │
-│                     │
-│   Quit              │
-└─────────────────────┘
+│.....................│
+
 ```
 
+</sup>
+
 ## Prerequisites
 
 Core library: A C99 compiler (no VLAs required), plus enough libc for `malloc`, `realloc`, `free`, `memcpy`, `memset`, and `memmove`. (Also, `#pragma once` must be supported.)