drop lgtm analysis

the old way of running lgtm does not work anymore

README.md

@@ -7,7 +7,6 @@ If you find rdfind useful, [drop me an email](mailto:__please_remove_this_antisp
 ## Continuous integration status
 | Status (main) | Status (devel)| Description
 |-------------|-------------|------------------
-| [![Total alerts](https://img.shields.io/lgtm/alerts/g/pauldreik/rdfind.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/pauldreik/rdfind/alerts/) | N/A | Static analyzer (LGTM)
 | [![build status](https://github.com/pauldreik/rdfind/actions/workflows/cppcheck.yml/badge.svg?branch=main)](https://github.com/pauldreik/rdfind/actions/workflows/cppcheck.yml?query=branch%3Amain) | [![build status](https://github.com/pauldreik/rdfind/actions/workflows/cppcheck.yml/badge.svg?branch=devel)](https://github.com/pauldreik/rdfind/actions/workflows/cppcheck.yml?query=branch%3Adevel) | Static analyzer (cppcheck)|
 | [![build status](https://github.com/pauldreik/rdfind/actions/workflows/ubuntu-default.yml/badge.svg?branch=main)](https://github.com/pauldreik/rdfind/actions/workflows/ubuntu-default.yml?query=branch%3Amain) | [![build status](https://github.com/pauldreik/rdfind/actions/workflows/ubuntu-default.yml/badge.svg?branch=devel)](https://github.com/pauldreik/rdfind/actions/workflows/ubuntu-default.yml?query=branch%3Adevel) | Builds and tests on Ubuntu 20.04 and 22.04 with the default compiler and settings |
 |  [![build status](https://github.com/pauldreik/rdfind/actions/workflows/mac.yml/badge.svg?branch=main)](https://github.com/pauldreik/rdfind/actions/workflows/mac.yml?query=branch%3Amain) | [![build status](https://github.com/pauldreik/rdfind/actions/workflows/mac.yml/badge.svg?branch=devel)](https://github.com/pauldreik/rdfind/actions/workflows/mac.yml?query=branch%3Adevel) | Compiles on Mac OS X|