Use mattkretz/howfairis instead of github action

ChangeLog:

	* .github/workflows/fair-software.yml: Rewrite.
	* LICENSES/Apache-2.0.txt: Removed.
	* README.md: Update badge after howfairis detects Conan.

.github/workflows/fair-software.yml

@@ -1,18 +1,26 @@
-# SPDX-License-Identifier: Apache-2.0
+# SPDX-License-Identifier: CC0-1.0
 # SPDX-FileCopyrightText: 2023–2024 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH / Matthias Kretz <[email protected]>
 
 name: fair-software
 
-on: push
+on:
+  push:
+    branches: [ master, main ]
 
 jobs:
   verify:
     name: "fair-software"
     runs-on: ubuntu-latest
     steps:
-      - uses: fair-software/[email protected]
-        name: Measure compliance with fair-software.eu recommendations
+      - uses: actions/checkout@v4
+        with:
+          repository: mattkretz/howfairis
+          path: howfairis
+
+      - name: Install mattkretz/howfairis
+        run: pip install ./howfairis
+
+      - name: Measure compliance with fair-software.eu recommendations
         env:
           PYCHARM_HOSTED: "Trick colorama into displaying colored output"
-        with:
-          MY_REPO_URL: "https://github.com/${{ github.repository }}"
+        run: howfairis "https://github.com/${{ github.repository }}"

README.md

@@ -5,7 +5,7 @@
 [![DOI](https://zenodo.org/badge/536945709.svg)](https://zenodo.org/badge/latestdoi/536945709)
 [![OpenSSF Best Practices](https://bestpractices.coreinfrastructure.org/projects/6916/badge)](https://bestpractices.coreinfrastructure.org/projects/6916)
 [![REUSE status](https://github.com/mattkretz/vir-simd/actions/workflows/reuse.yml/badge.svg)](https://github.com/mattkretz/vir-simd/actions/workflows/reuse.yml)
-[![fair-software.eu](https://img.shields.io/badge/fair--software.eu-%E2%97%8F%20%20%E2%97%8F%20%20%E2%97%8B%20%20%E2%97%8F%20%20%E2%97%8F-yellow)](https://fair-software.eu)
+[![fair-software.eu](https://img.shields.io/badge/fair--software.eu-%E2%97%8F%20%20%E2%97%8F%20%20%E2%97%8F%20%20%E2%97%8F%20%20%E2%97%8F-green)](https://fair-software.eu)
 
 This project aims to provide a fallback std::experimental::simd (Parallelism TS 2)
 implementation with additional features. Not every user can rely on GCC 11+