Fix image path errors

docs/Guides/Edit the Firmware.md

@@ -1,6 +1,6 @@
 The data board of your SmartSmart Citizen Kit is has two **two microcontrollers**:
 
-![](../../../../assets/images/sck_2/SCK21_Microcontrollers.png)
+![](../assets/images/sck_2/SCK21_Microcontrollers.png)
 
 The main one is an **Atmel SAMD21**, this chip is in charge of all the normal tasks like reading the sensors, saving data, interacting with the user, etc. For this chip we need two software components the bootloader and the main firmware.
 
@@ -31,7 +31,7 @@ The _bootloader_ and _tools_ repositories are [submodules](https://git-scm.com/b
 
 If your kit doesn't have the bootloader already flashed (all the kits that we ship come with it) you will need an [ATMEL-ICE](https://www.digikey.es/en/product-highlight/a/atmel/atmel-ice-programmer-debugger) programmer. This process can also be done with a Raspberry Pi computer and the proper [connector](https://www.adafruit.com/product/2094) and cables, in [this guide](https://docs.smartcitizen.me/Guides/Debug%20the%20firmware/) you will find informtaion on how to do this.
 
-![](../../../../assets/images/sck_2/SCK21_data_connectors.png)
+![](../assets/images/sck_2/SCK21_data_connectors.png)
 
 Connect the Atmel-ICE programmer to the 10 pin SWD connector and to your computer. Power the SCK via USB, you can use any USB charger or even your computer.
 
@@ -44,19 +44,19 @@ cd smartcitizen-kit-21
 
 You will see a lot of output when compiling, the led on the SCK should _breath_ in **green** and you should see an output similar to this:
 
-![](../../../../assets/images/sck_2/flashing_bootloader.png)
+![](../assets/images/sck_2/flashing_bootloader.png)
 
 You are ready for the next step, just remember to disconnect the Atmel-ICE programmer and connect the SCK to your computer with a USB cable.
 
 ## SAMD21 firmware
 
 The bootloader we just flashed allows a very simple way of uploading the SCK firmware based on the [UF2](https://github.com/Microsoft/uf2) format, when you **double-click the reset button** of your kit it will expose a [MSD](https://en.wikipedia.org/wiki/USB_mass_storage_device_class) interface to your computer and a new drive will popup where you can just drag the compiled firmware file (converted to UF2 format).
 
-![Reset button](../../../../assets/images/sck_2/SCK21_Reset.png)
+![Reset button](../assets/images/sck_2/SCK21_Reset.png)
 
 ### Build script
 
-![](../../../../assets/images/sck_2/build_script_usage.png)
+![](../assets/images/sck_2/build_script_usage.png)
 
 You can use the same script used to flash the bootloader (`make.py`) that will do everything for you: compile the firmware, convert the binary to UF2 format and upload it to the kit:
 
@@ -66,7 +66,7 @@ python3 make.py build flash sam
 
 If this is your first time building the software, platformio will take a while installing all the needed dependencies, be patient. If there are no errors you should see an output similar to this:
 
-![](../../../../assets/images/sck_2/flashing_firmware.png)
+![](../assets/images/sck_2/flashing_firmware.png)
 
 A copy of the compiled software in UF2 format called _SAM_firmware.uf2_ will remain in the _bin_ folder. You can use this file to reflash your kit without compiling it again. 
 
@@ -84,7 +84,7 @@ pio run
 
 After a lot of compilation messages you should see an output similar to this:
 
-![](../../../../assets/images/sck_2/pio_run.png)
+![](../assets/images/sck_2/pio_run.png)
 
 then to convert the binary firmware to UF2 format do:
 
@@ -95,11 +95,11 @@ cd ..
 
 you should see something like this:
 
-![](../../../../assets/images/sck_2/uf2_conv.png)
+![](../assets/images/sck_2/uf2_conv.png)
 
 Now **double-click the reset button of your kit** open your favorite file browser and drag the file you just created to the _SCK-2.0_ drive. The kit will reset and run the new firmware.
 
-![](../../../../assets/images/sck_2/drag_firmware.png)
+![](../assets/images/sck_2/drag_firmware.png)
 
 !!! info
 	Keep in mind that if your computer is not configured to automount new drives you will need to mount your sck manually ([as any other USB drive](https://linuxconfig.org/howto-mount-usb-drive-in-linux)).
@@ -116,7 +116,7 @@ As before, if this is the first time you do it, it will take a while on download
 In this case the upload process is different, since the ESP8266 chip is not connected to the USB interface the data must be uploadded through the SAMD21 chip.
 Our [upload script](https://github.com/fablabbcn/smartcitizen-kit-21/blob/master/make.py) takes care of searching for a SCK on the USB bus, sending a command to the kit so it put's himself in what we call _bridge mode_ (white led) and uploading the firmware. This is the expected output:
 
-![](../../../../assets/images/sck_2/flashing_ESP_firmware.png)
+![](../assets/images/sck_2/flashing_ESP_firmware.png)
 
 !!! info
 	Sometimes the ESP8266 and the uploader software don't get synced and the upload fails. Normally if you try again it will work. After first try you don't need to rebuild, you can just do `python3 make.py flash esp`.