[IMP] developer: add an article to explain error handling in JS

closes #9308

X-original-commit: 489fe7d
Signed-off-by: Samuel Degueldre (sad) <[email protected]>

Author: sdegueldre

content/developer/reference/frontend.rst

@@ -16,6 +16,7 @@ Web framework
    frontend/services
    frontend/hooks
    frontend/patching_code
+   frontend/error_handling
    frontend/javascript_reference
    frontend/mobile
    frontend/qweb