readme: drop lgtm badges, as the service no longer exists

(cherry picked from commit 4e3a0b7)

Author: razvancrainea

README.md

@@ -3,8 +3,6 @@
 [![OSS-Fuzz](https://github.com/OpenSIPS/opensips/actions/workflows/cifuzz.yml/badge.svg?branch=master)](https://github.com/OpenSIPS/opensips/actions/workflows/cifuzz.yml?query=branch%3Amaster++)
 [![Cross Platform Builds](https://github.com/OpenSIPS/opensips/actions/workflows/multiarch.yml/badge.svg?branch=master)](https://github.com/OpenSIPS/opensips/actions/workflows/multiarch.yml?query=branch%3Amaster++)
 [![Coverity Scan Build Status](https://scan.coverity.com/projects/7580/badge.svg)](https://scan.coverity.com/projects/opensips-opensips)
-[![Code Quality: Cpp](https://img.shields.io/lgtm/grade/cpp/g/OpenSIPS/opensips.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/OpenSIPS/opensips/context:cpp)
-[![Total Alerts](https://img.shields.io/lgtm/alerts/g/OpenSIPS/opensips.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/OpenSIPS/opensips/alerts)
 
 # Welcome to OpenSIPS Project