SD card support (#23)

### General
- Added support for SD cards in `HadwareConfig`
- Properly disabled PC build for now (I was still getting error emails)
- Updated `README.md` with a device compatibility table

### T-Deck:
- Implemented SD card support
- Logging message cleanup
- Updated `config,h` with various new settings
- Reduced stack depth from `8096` to `5000`

boards/lilygo_tdeck/lilygo_tdeck.c

@@ -4,7 +4,10 @@
 bool tdeck_bootstrap();
 bool tdeck_init_lvgl();
 
+extern SdCard tdeck_sdcard;
+
 const HardwareConfig lilygo_tdeck = {
     .bootstrap = &tdeck_bootstrap,
-    .init_lvgl = &tdeck_init_lvgl
+    .init_lvgl = &tdeck_init_lvgl,
+    .sdcard = &tdeck_sdcard
 };