Fix:

• JavaScript error causing customizer to not load for a few users due to conflict with some third-party plugins.
• Do not load accessibility fix for skip link in AMP endpoint as it is included in the amphtml (props @amedina)
• Rename function astra_is_emp_endpoint() to astra_is_amp_endpoint() and deprecate astra_is_emp_endpoint() to fix the typo in the function name.