Moved the configuration files to a dedicated folder

etc/mkdocs.yml

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+site_name: Gitea for PHP
+site_description: Gitea client library, in PHP.
+site_author: SAB International - contact@sabcomputer.com
+site_url: https://dev.sabcomputer.com/gitea.php
+
+docs_dir: ../doc
+site_dir: ../web
+
+repo_name: GitHub
+repo_url: https://github.com/sab-international/gitea.php
+edit_uri: ''
+
+copyright: Copyright © 2018 - 2019 SAB International
+google_analytics:
+  - !!python/object/apply:os.getenv [GOOGLE_ANALYTICS_ID]
+  - auto
+
+extra:
+  social:
+    - {type: globe, link: 'http://www.sabcomputer.com'}
+    - {type: github, link: 'https://github.com/sab-international'}
+    - {type: facebook, link: 'https://www.facebook.com/sabinternational34'}
+    - {type: twitter, link: 'https://twitter.com/SABDistribution'}
+    - {type: linkedin, link: 'https://linkedin.com/company/sab-international-sarl'}
+
+markdown_extensions:
+  - admonition
+  - codehilite
+  - meta
+
+nav:
+  - Overview: index.md
+  - Installation: installation.md
+  - Usage: usage.md
+  - About:
+      - Changelog: about/changelog.md
+      - License: about/license.md
+      - See also: about/see_also.md
+
+theme:
+  name: material
+  favicon: img/favicon.ico
+  palette: {primary: deep purple, accent: deep purple}

etc/phpdoc.xml

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+<?xml version="1.0"?>
+<phpdoc>
+  <title>Gitea for PHP</title>
+
+  <parser>
+    <target>../var</target>
+  </parser>
+  <transformer>
+    <target>../doc/api</target>
+  </transformer>
+  <transformations>
+    <template name="responsive"/>
+  </transformations>
+
+  <files>
+    <directory>../src</directory>
+  </files>
+</phpdoc>

etc/phpstan.neon

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+parameters:
+  level: max
+  paths: [src]

etc/phpunit.xml

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+<?xml version="1.0"?>
+<phpunit bootstrap="../vendor/autoload.php" cacheResult="false">
+  <filter>
+    <whitelist processUncoveredFilesFromWhitelist="true">
+      <directory suffix=".php">../src</directory>
+    </whitelist>
+  </filter>
+
+  <logging>
+    <log type="coverage-clover" target="../var/coverage.xml"/>
+  </logging>
+
+  <testsuites>
+    <testsuite name="all">
+      <directory suffix="Test.php">../test</directory>
+    </testsuite>
+  </testsuites>
+</phpunit>