Removed old PHP code, migrated to Python and Flask

Update .dockerignore, .env, and 503 more files...

data/strings/en/sidebar.yml

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+# FR - Sidebar
+
+logo.alt: Website's logo
+
+text.home: Home
+text.shop: Shop
+text.school: Training
+text.articles: Articles
+text.projects: Projects
+text.applications: Applications
+text.libraries: Libraries
+text.electronics: Electronics
+text.3d-print: 3D Printing
+text.tools: Tools
+text.links: Links
+text.downloads: Downloads
+text.gitea: Git Repos.
+text.wiki: Wiki
+text.about: About
+text.contributors: Contributors
+text.contact: Contact