Update RPi instructions

raspberry/README.md

-How to install gr-bladeRF to 
+   ## How to install gr-bladeRF on Raspberry Pi 4
 
-O. Prepare Raspberry Pi4
+   ### 1. Prepare Raspberry Pi4
 
-0.1. Download and install rpi-imager:
+   #### 1.1. Download and install rpi-imager:
    visit https://www.raspberrypi.com/software and download rpi imager
    or run
    ```
    wget https://downloads.raspberrypi.org/imager/imager_latest_amd64.deb
    sudo dpkg -i imager_1.6.2_amd64.deb 
    ```
-0.2. Flash image and setup network
+   #### 1.2. Flash image and setup network
    Insert microSD card to slot on your computer an run rpi-imager
    
-   Choose OS: Other general purpose OS - Ubuntu - Ubuntu Server 21.04.3 LTS (RPi 3/4/400) 64-bit server OS for arm64 architectures
+   Choose OS: `Other general purpose OS` - `Ubuntu` - `Ubuntu Server 21.04.3 LTS (RPi 3/4/400) 64-bit server OS for arm64 architectures`
    
    Choose storage - your microSD card
    
-   Press write
+   Press `WRITE`
    
    Insert microSD into RPi and plug ethernet & power cables.
 
-0.3. Determining the Pi’s IP address
+   #### 1.3. Determining the Pi’s IP address
+   
 To determine the IP address of your board, open a terminal and run the `arp` command:
 
 On Ubuntu and Mac OS:
-    ```
+   
+   
     arp -na | grep -i "e4:5f"   
     ? (192.168.1.105) at e4:5f:01:35:c0:92 [ether] on wlp3s0
-    ```
-   ubuntu@ubuntu:~$ sudoedit /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
       
 Connect to rpi4 via ssh:
-      ```
       ssh ubuntu@192.168.1.105
-      ```
+
 password: `ubuntu`
 Change password on first login and connect again.
       
-0.5. Install a desktop
+   #### 1.5. Install a desktop
 
-   check architecture
-   ```
-   ubuntu@ubuntu:~$ dpkg --print-architecture 
-   arm64
-   ```
-   ```
    sudo apt update
    sudo apt -y upgrade   
    sudo apt install -y xubuntu-desktop
-   ```
    
-2. Install bladeRF
+   ### 2. Install bladeRF
+
 
-    ```
     sudo add-apt-repository ppa:nuandllc/bladerf
     sudo apt-get update
     sudo apt-get install -y bladerf libbladerf-dev bladerf-firmware-fx3    
@@ -60,10 +52,11 @@ O. Prepare Raspberry Pi4
     sudo apt-get install bladerf-fpga-hostedx115  # for bladeRF x115
     sudo apt-get install bladerf-fpga-hostedxa4   # for bladeRF 2.0 Micro A4
     sudo apt-get install bladerf-fpga-hostedxa9   # for bladeRF 2.0 Micro A9
-    ```
+
 Check bladeRF:
-    ```
-    ubuntu@ubuntu:~$ bladeRF-cli -i
+
+   `ubuntu@ubuntu:~$ bladeRF-cli -i`
+   
         bladeRF> info
 
           Board:                    Nuand bladeRF 2.0 (bladerf2)
@@ -79,21 +72,21 @@ O. Prepare Raspberry Pi4
           Instance:                 0
 
         bladeRF> exit
-    ```
-3. Crossplatform build volk and gnuradio using docker and install on RPi
+    
+   ### 3. Crossplatform build volk and gnuradio using docker and install on RPi
 
     ./build_gnuradio.sh 
     
 Transfer files to RPi:
-    ```
+
     scp *.deb ubuntu@192.168.1.105:/home/ubuntu
-    ```
+
 Connect to RPi
 
     ssh -X ubuntu@192.168.1.105 # -X for run GUI applications
 
 Install 
-    ```  
+
     sudo dpkg -i volk.deb
     sudo dpkg -i gnuradio.deb
     sudo apt-get install -y libusb-1.0-0-dev libusb-1.0-0 git cmake g++ \
@@ -104,20 +97,21 @@ O. Prepare Raspberry Pi4
        python3-zmq python3-scipy python3-gi python3-gi-cairo gir1.2-gtk-3.0 \
        libcodec2-dev libgsm1-dev libqt5svg5-dev libpulse-dev pulseaudio alsa-base \
        libasound2 libasound2-dev pybind11-dev libsndfile-dev
-    ```
+
 Run gnuradio
-    ```
+
     export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
     gnuradio-companion
-    ```
-4. Build and install gr-iqbal, gr-osmosdr, gr-bladeRF
+
+    
+   ### 4. Build and install gr-iqbal, gr-osmosdr, gr-bladeRF
 
 Make directory for source
-    ```
+
     mkdir ~/gr
-    ```
-    # gr-iqbal
-    ```
+
+###### gr-iqbal
+
     cd ~/gr
     git clone git://git.osmocom.org/gr-iqbal
     cd gr-iqbal
@@ -126,10 +120,10 @@ O. Prepare Raspberry Pi4
     cmake ..
     make -j$(nproc) 
     sudo make install && sudo ldconfig
-    ```
-    # gr-osmosdr
-    #############
-    ```
+
+
+###### gr-osmosdr
+
     cd ~/gr
     git clone https://git.osmocom.org/gr-osmosdr
     cd gr-osmosdr
@@ -137,10 +131,10 @@ O. Prepare Raspberry Pi4
     cmake ..
     make -j$(nproc)
     sudo make install && sudo ldconfig
-    ```
-    #gr-bladeRF
-    ############
-    ```
+    
+
+###### gr-bladeRF
+
     cd ~/gr
     git clone https://github.com/Nuand/gr-bladeRF.git
     cd gr-bladeRF
@@ -149,16 +143,10 @@ O. Prepare Raspberry Pi4
     cmake ..
     make -j4
     sudo make install
-    ```
 
-    Check `gr-bladeRF`:
 
-    Setup audio forwarding:
-    ```    
-    scp ~/.config/pulse/cookie ubuntu@192.168.1.105:/home/ubuntu/.config/pulse/cookie
-    ```
+###### Check `gr-bladeRF`:
 
-    ```
     gnuradio-companion ~/gr/gr-bladeRF/apps/fm_receiver.grc
-    ```
+