Add CodeQL workflow

Add workflow to replace LGTM, which will be shutdown soon.
Replace LGTM badges in the README.
Remove LGTM configuration file.

Signed-off-by: thc202 <[email protected]>

.github/workflows/codeql.yml

@@ -0,0 +1,33 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'java', 'javascript' ]
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: github/codeql-action/init@v2
+        with:
+          languages: ${{ matrix.language }}
+      - uses: github/codeql-action/autobuild@v2
+      - uses: github/codeql-action/analyze@v2
+        with:
+          category: "/language:${{matrix.language}}"

README.md

@@ -1,8 +1,7 @@
 # ![HUD Logo](https://raw.githubusercontent.com/zaproxy/zap-hud/main/assets/images/hud_logo_128px.png) OWASP ZAP Heads Up Display 
 ![Release: Beta](https://img.shields.io/badge/release-beta-brightgreen.svg)
 [![Known Vulnerabilities](https://snyk.io/test/github/zaproxy/zap-hud/badge.svg?targetFile=package.json)](https://snyk.io/test/github/zaproxy/zap-hud?targetFile=package.json)
-[![Total alerts](https://img.shields.io/lgtm/alerts/g/zaproxy/zap-hud.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/zaproxy/zap-hud/alerts/)
-[![Language grade: JavaScript](https://img.shields.io/lgtm/grade/javascript/g/zaproxy/zap-hud.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/zaproxy/zap-hud/context:javascript)
+[![CodeQL](https://github.com/zaproxy/zap-hud/actions/workflows/codeql.yml/badge.svg)](https://github.com/zaproxy/zap-hud/actions/workflows/codeql.yml)
 
 <img align="center" alt="Welcome to the HUD" src="assets/images/ZAP-HUD-Welcome-banner.png" width="100%">