ci: drop LGTM stuff and move remaining bits into a new location

.github/codeql-config.yml

@@ -9,4 +9,4 @@ queries:
   - name: Enable possibly useful queries which are disabled by default
     uses: ./.github/codeql-custom.qls
   - name: systemd-specific CodeQL queries
-    uses: ./.lgtm/cpp-queries/
+    uses: ./.github/codeql-queries/

.lgtm.yml

@@ -1,40 +0,0 @@
----
-# vi: ts=2 sw=2 et:
-# SPDX-License-Identifier: LGPL-2.1-or-later
-
-# Explicitly enable certain checks which are hidden by default
-queries:
-  - include: cpp/bad-strncpy-size
-  - include: cpp/declaration-hides-variable
-  - include: cpp/inconsistent-null-check
-  - include: cpp/mistyped-function-arguments
-  - include: cpp/nested-loops-with-same-variable
-  - include: cpp/sizeof-side-effect
-  - include: cpp/suspicious-pointer-scaling
-  - include: cpp/suspicious-pointer-scaling-void
-  - include: cpp/suspicious-sizeof
-  - include: cpp/unsafe-strcat
-  - include: cpp/unsafe-strncat
-  - include: cpp/unsigned-difference-expression-compared-zero
-  - include: cpp/unused-local-variable
-  - include:
-      tags:
-        - "security"
-        - "correctness"
-      severity: "error"
-
-extraction:
-  cpp:
-    prepare:
-      packages:
-        - libpwquality-dev
-        - libfdisk-dev
-        - libp11-kit-dev
-        - libssl-dev
-        - python3-jinja2
-    after_prepare:
-      - pip3 install -r .github/workflows/requirements.txt --require-hashes
-      - export PATH="/opt/work/.local/bin:$PATH"
-  python:
-    python_setup:
-      version: 3