Refactor RGB to Grayscale Converter and Add Divider Component

- Updated the rgb2gray.vhd file to improve readability and structure, including consistent casing for keywords and signals.
- Implemented a new divider_by_3 component to calculate the grayscale value by dividing the sum of RGB channels by 3.
- Enhanced the state machine in rgb2gray to handle RGB input and output grayscale values correctly.
- Updated the Vivado project file to include the new divider_by_3.vhd for synthesis and simulation.
- Modified vhdl_ls.toml to include unisim files for third-party library support.

vhdl_ls.toml

@@ -11,7 +11,7 @@ lab1_lib.files = [
 ]
 
 lab2_lib.files = [
-    "LAB2/src/**/*.vhd",
+    "LAB2/src/*.vhd",
     "LAB2/sim/**/*.vhd"
 ]
 
@@ -23,4 +23,9 @@ lab2_lib.files = [
 xpm.files = [
   "C:/Xilinx/Vivado/2020.2/data/ip/xpm/xpm_VCOMP.vhd"
 ]
-xpm.is_third_party = true
+xpm.is_third_party = true
+
+unisim.files = [
+  "C:/Xilinx/Vivado/2020.2/data/vhdl/src/unisims/**/*.vhd"
+]
+unisim.is_third_party = true