Introduce multi-lingual docs

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

docs/fr/docs/index.md

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+---
+title: Documentation de Mobilizon
+---
+
+Bienvenue sur la documentation de Mobilizon
+
+* [En apprendre plus à propos de Mobilizon](/about) (en anglais)
+* Apprendre comment utiliser Mobilizon (pas encore écrit)
+* [Apprendre à installer Mobilizon](/administration) (en anglais)
+* [Apprendre à contribuer à Mobilizon](/contribute) (en anglais)

docs/fr/mkdocs.yml

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+site_name: Mobilizon
+repo_name: "framasoft/mobilizon"
+repo_url: "https://framagit.org/framasoft/mobilizon"
+site_dir: "../../site/fr"
+extra:
+  social:
+    - icon: "fontawesome/brands/twitter"
+      link: "https://twitter.com/joinmobilizon"
+markdown_extensions:
+  - admonition
+  - codehilite
+  - footnotes
+  - meta
+  - toc:
+      permalink: true
+  - pymdownx.superfences
+  - pymdownx.magiclink
+  - pymdownx.smartsymbols
+  - pymdownx.tabbed
+  - pymdownx.tilde
+  - pymdownx.mark
+plugins:
+  - search:
+      lang: ["fr"]
+  - git-revision-date-localized
+  - minify:
+      minify_html: true
+theme:
+  name: "material"
+  language: "fr"
+  features:
+    - instant
+    - tabs
+  custom_dir: "../theme/"
+  palette:
+    primary: "amber"
+    accent: "deep purple"
+    scheme: slate
+  font: false
+  icon:
+    logo: material/calendar
+    repo: fontawesome/brands/gitlab

docs/javascripts/redirect.js

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+const languages = ["fr"];
+
+const navigatorLanguage =
+  window.navigator.userLanguage || window.navigator.language;
+
+let language;
+if (languages.includes(navigatorLanguage)) {
+  language = navigatorLanguage;
+}
+const split = navigatorLanguage.split("-")[0];
+if (languages.includes(split)) {
+  language = split;
+}
+const url = new URL(window.location.href);
+if (language && (url.pathname === "/" || url.pathname.startsWith("/use/"))) {
+  url.pathname = `/${language}${url.pathname}`;
+  window.location.replace(url);
+}

docs/theme/main.html

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+{% extends "base.html" %}
+
+{% block site_meta %}
+  {% if page.is_homepage %}
+    <link rel="alternate" hreflang="fr" href="{{ config.site_url }}fr/" />
+  {% endif %}
+{% endblock %}