Add Some Files to .gitattributes

.gitattributes

@@ -5,16 +5,28 @@
 /.gitignore export-ignore
 /.php-cs-fixer.dist.php export-ignore
 /.phpcs.xml.dist export-ignore
+/.readthedocs.mkdocs.yaml export-ignore
+/.readthedocs.readthedocs.yaml export-ignore
+/.readthedocs.material.yaml export-ignore
+/.readthedocs.materialx.yaml export-ignore
+/.readthedocs.properdocs.yaml export-ignore
 /.readthedocs.yaml export-ignore
-/.scrutinizer.yml export-ignore
+/.readthedocs.zensical.yaml export-ignore
 /CHANGELOG.PHPExcel.md export-ignore
 /bin export-ignore
 /composer.lock export-ignore
 /docs export-ignore
 /infra export-ignore
+/mkdocs.material.yml export-ignore
+/mkdocs.materialx.yml export-ignore
+/mkdocs.mkdocs.yml export-ignore
+/mkdocs.readthedocs.yml export-ignore
 /mkdocs.yml export-ignore
 /phpstan-baseline.neon export-ignore
 /phpstan.neon.dist export-ignore
 /phpunit.xml.dist export-ignore
+/properdocs.yml export-ignore
 /samples export-ignore
 /tests export-ignore
+/zensical.classic.toml export-ignore
+/zensical.toml export-ignore