Refactor and clean up project files

- Removed obsolete GraphML file `pak_depak.bda` and UI file `bd_c9b29a54.ui`.
- Updated `rgb2gray.vhd` to improve signal handling and state machine logic.
- Created new Vivado project files for `depacketizer_test`, including testbench configuration.
- Adjusted `pak_depak.xpr` to disable the FIFO module and set the top module correctly.
- Updated `rgb2grey_test.xpr` to modify simulation launch settings.

LAB2/sim/tb_packetizer.vhd

@@ -71,8 +71,6 @@ ARCHITECTURE Behavioral OF tb_packetizer IS
         7 => x"90"
     );
 
-    SIGNAL data_index : INTEGER := 0;
-
     SIGNAL tready_block_req : STD_LOGIC := '0';
 
 BEGIN