docs: document CAN bootloader protocol

docs/protocan/build-html.bat

@@ -0,0 +1,19 @@
+@echo off
+setlocal
+
+set "SCRIPT_DIR=%~dp0"
+
+where pwsh.exe >nul 2>nul
+if %ERRORLEVEL% EQU 0 (
+    pwsh.exe -NoLogo -NoProfile -ExecutionPolicy Bypass -File "%SCRIPT_DIR%build-html.ps1" %*
+) else (
+    powershell.exe -NoLogo -NoProfile -ExecutionPolicy Bypass -File "%SCRIPT_DIR%build-html.ps1" %*
+)
+
+set "EXIT_CODE=%ERRORLEVEL%"
+if not "%EXIT_CODE%"=="0" (
+    echo.
+    echo Ошибка сборки HTML. Код: %EXIT_CODE%
+)
+
+exit /b %EXIT_CODE%