docs/develop: More reorganization.

* There is now a 'busses' folder, and the extant USB/SDHCI/Bluetooth/etc.
   docs now live in it, instead of various other places.
 * kernel/ports is now kernel/arch, like it is in src/system.
   SPARC documentation is now in there, too.
 * VM files (these are rather outdated) are now in kernel/vm.
 * SCSI ASC info removed, this is easily available online and
   it doesn't seem to be very relevant.

docs/develop/busses/bluetooth/overview.md

@@ -0,0 +1,17 @@
+(Copied mostly from <http://urnenfeld.blogspot.de/2012/07/in-past-i-got-to-know-that-motivation.html>)
+
+**L2cap under `network/protocols/l2cap`**: Provides socket interface to have l2cap channels. L2CAP offers connection oriented and connectionless sockets. But bluetooth stack as this point has no interchangeability with TCP/IP, A Higher level Bluetooth profile must be implemented
+
+**HCI under `src/add-ons/kernel/bluetooth`**: Here we have 2 modules, one for handling global bluetooth data structures such as connection handles and L2cap channels, and frames
+
+**H2generic under `src/add-ons/kernel/drivers/bluetooth`**: The USB driver, implementing the H2 transport.
+
+**Bluetooth kit under `src/kit/bluetooth`**: C++ implementation based on JSR82 api.
+
+**Bluetooth Server under `src/servers/bluetooth`**: Basically handling opened devices (local connected fisically in our system) and forwaring kit calls to them.
+
+**Bluetooth Preferences under `src/preferences/bluetooth`**: Configuration using the kit
+
+**Test applications under `src/tests/kits/bluetooth`**.
+
+There is a small prototype component which is not here documented below  src/add-ons/bluetooth/ResetLocalDevice. Its intention was to be an add-on of bluetooth preferences, So that new HCI commands could be customized by users or external developers. I did not like at the end the idea, I did not find the flexibility I wanted.