chore(docs): update README

Introduce a quick-ref section.

README.md

@@ -67,26 +67,93 @@ This can also be run using `nix run . -- flash` without entering the dev shell.
 - Run `flash`
 - Done!
 
-## Bootloader Mode
+## Quick reference
 
-Bootloader mode can be entered two ways:
+### Booting into bootloader mode
 
-### With the keyboard half powered off
+See the [user guide](https://docs.moergo.com/glove80-user-guide/customizing-key-layout/#putting-glove80-into-bootloader-for-firmware-loading) for more info.
 
-- Hold the outside bottom-row key (traditionally, `<Ctrl>`)
-- Hold the middle-finger row-2 key (Colemak `F` or `U`, Qwerty `E` or `I`)
+- Hold the `C6 R6` key (extreme bottom corner)
+- Also hold the `C3 R2` key (middle-finger; Colemak `F` or `U`, Qwerty `E` or `I`)
 - Power on the keyboard
 
-### With the keyboard half powered on
+![Activating bootloader](https://docs.moergo.com/glove80-user-guide/images/bootloader-power-up-method.png)
+
+#### You can tell if a Glove80 half is in bootloader mode using the red LED next to the power switch:
+
+- Slow LED: in bootloader mode and connected via USB.
+- Fast LED: in bootloader mode but there is no USB connection.
+- Solid or no LED: not in bootloader mode.
+
+### Factory reset
+
+See the [user guide](https://docs.moergo.com/glove80-user-guide/troubleshooting/#configuration-factory-reset-and-re-pairing-left-and-right-halves) for more info.
+
+Similar to booting into bootloader mode, but use `R2` (numrow) instead of `R3`. Hold for ~5s powered on, before powering off again.
+
+![Activating reset](https://docs.moergo.com/glove80-user-guide/images/configuration-factory-reset.png)
+
+Note, the reset will not affect the saved keymap. Instead it wipes things like Bluetooth devices.
+
+To re-pair the two halves: first power both on at the same time, then toggle RGB on/off with (Colemak) `Magic`+`B` or (Qwerty) `Magic`+`T`.
+
+### Bluetooth
+
+See the [user guide](https://docs.moergo.com/glove80-user-guide/operating-glove80-wirelessly) for more info.
+
+#### Status
+
+When tapping the `Magic` key, status indicators will appear on the Bluetooth keys.
+
+<!-- Catppuccin themed "LED indicator" bullet points 😅 -->
+<p>
+  <img alt="White LED"
+    title="White LED"
+    height="11"
+    hspace="4"
+    src="https://github.com/MattSturgeon/glove80-config/assets/5046562/46cf34a5-efa4-4b6c-a9d5-703b4d4c32bd">
+  <strong>Connected</strong> (in use)
+  <br>
+  <img alt="Green LED"
+    title="Green LED"
+    height="11"
+    hspace="4"
+    src="https://github.com/MattSturgeon/glove80-config/assets/5046562/41369794-bf61-4873-b7fc-4949868a322e">
+  <strong>Connected</strong> (not in use)
+  <br>
+  <img alt="Red LED"
+    title="Red LED"
+    height="11"
+    hspace="4"
+    src="https://github.com/MattSturgeon/glove80-config/assets/5046562/da7e6899-9833-4c82-a856-947f8f429d1a">
+  <strong>Paired</strong> (not connected)
+  <br>
+  <img alt="Purple LED"
+    title="Purple LED"
+    height="11"
+    hspace="4"
+    src="https://github.com/MattSturgeon/glove80-config/assets/5046562/0579c055-75ff-4ddd-9a99-a7fadd3df992">
+  <strong>Not paired</strong>
+</p>
+
+
+#### Pairing
+
+- First ensure the profile is unpaired (white status LED)
+- Select the profile
+- Pair using the host device's interface
+
+#### Unpairing
+
+Unpair the selected Bluetooth profile using the `BT_Clear` key (see [magic layer] above). Alternatively unpair all devices using `BT_Clear_All`.
 
-- Hold the Magic key
-- Tap the outside home-row key (traditionally, `<CAPS>` or `'`)
 
 ## Resources
 - [@nickcoutsos]'s [Keymap Editor].
 - [@caksoylar]'s [Keymap Drawer].
 
 - [Glove80 User Guide](https://docs.moergo.com/glove80-user-guide).
+- [Glove80 Troubleshooting](https://docs.moergo.com/troubleshooting-faqs).
 - MoErgo's [Glove80 Support](https://moergo.com/glove80-support) page.
 - MoErgo's [Discord Server](https://moergo.com/discord).
 
@@ -95,6 +162,7 @@ Bootloader mode can be entered two ways:
 
 - MoErgo's [ZMK Distribution](https://github.com/moergo-sc/zmk).
 
+[magic layer]: #moergos-magic-layer
 [@nickcoutsos]: https://github.com/nickcoutsos
 [@caksoylar]: https://github.com/caksoylar
 [Keymap Editor]: https://github.com/nickcoutsos/keymap-editor