Introduce mkdocs.yml (#433)

mkdocs.yml

+site_name: Silkaj
+site_url: https://silkaj.duniter.org
+repo_url: https://git.duniter.org/clients/python/silkaj
+copyright: "Copyright © 2016 − 2025 Maël Azimi"
+repo_name: GitLab
+remote_branch: "pages"
+site_description: "Command line client for Ğ1 libre-currency powered by Duniter"
+theme:
+  name: material
+  logo: images/silkaj_logo.png
+  favicon: images/silkaj_logo.png
+  features:
+    - navigation.tracking
+    - navigation.tabs
+    - navigation.tabs.sticky
+    - navigation.sections
+    - content.code.copy
+    - content.tabs.link
+  font: false
+  palette:
+    - media: "(prefers-color-scheme: dark)"
+      scheme: default
+      toggle:
+        icon: material/brightness-4
+        name: Switch to light mode
+    - media: "(prefers-color-scheme: light)"
+      scheme: slate
+      toggle:
+        icon: material/brightness-7
+        name: Switch to dark mode
+markdown_extensions:
+  - attr_list
+  - md_in_html
+  - pymdownx.emoji:
+      emoji_index: !!python/name:material.extensions.emoji.twemoji
+      emoji_generator: !!python/name:material.extensions.emoji.to_svg
+  - pymdownx.highlight:
+      anchor_linenums: true
+      line_spans: __span
+      pygments_lang_class: true
+  - pymdownx.inlinehilite
+  - pymdownx.snippets
+  - pymdownx.superfences
+  - pymdownx.tabbed:
+      alternate_style: true
+  - toc:
+      permalink: true
+nav:
+  - index.md
+  - Installation: install_pipx.md
+  - Usage:
+    - how-to_automate_transactions_and_multi-output.md
+    - DeathReaper: deathreaper.md
+  - Blog:
+    - blog/index.md
+  - Changelog: changelog.md
+  - Contributing:
+    - contributing.md
+    - Poetry installation: install_poetry.md
+    - Docker installation: docker.md
+    - Documentation: documentation.md
+    - test_and_coverage.md
+    - Coverage report: coverage.md
+
+extra:
+  version:
+    provider: mike
+  social:
+    - icon: fontawesome/brands/gitlab
+      link: https://git.duniter.org/clients/python/silkaj
+      name: Git repository
+    - icon: fontawesome/brands/python
+      link: https://pypi.org/project/silkaj/
+      name: PyPI
+    - icon: simple/discourse
+      link: https://forum.duniter.org
+      name: Duniter forum
+    - icon: simple/xmpp
+      link: https://chat.duniter.org
+      name: Duniter XMPP chatroom
+
+plugins:
+  - blog:
+      pagination_per_page: 5
+      blog_toc: true
+      post_url_format: "{slug}"
+      archive_url_format: "{date}"
+      categories_url_format: "{slug}"
+  - coverage
+  - gitlab_links:
+      gitlab_url: "https://git.duniter.org/clients/python/silkaj"