Apply OmniPath brand theme to mkdocs

- Custom CSS with OmniPath colors: teal (#007B7F), green (#6EA945)
- Favicon from omnipathdb.org
- Material theme with light/dark toggle

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: deeenes

docs/assets/favicon-32x32.png

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+:root {
+  --md-primary-fg-color: #007B7F;
+  --md-accent-fg-color: #6EA945;
+}
+[data-md-color-scheme="slate"] {
+  --md-primary-fg-color: #007B7F;
+  --md-accent-fg-color: #6EA945;
+}
+.md-header {
+  background-color: #007B7F;
+}

docs/assets/favicon.ico

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+# cachedir
+
+Documentation coming soon.

docs/assets/omnipath-theme.css

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+site_name: cachedir
+site_url: https://saezlab.github.io/cachedir
+repo_url: https://github.com/saezlab/cachedir
+repo_name: saezlab/cachedir
+
+theme:
+  name: material
+  favicon: assets/favicon.ico
+  icon:
+    logo: material/database
+  palette:
+    - media: "(prefers-color-scheme: light)"
+      scheme: default
+      primary: custom
+      accent: custom
+      toggle:
+        icon: material/brightness-7
+        name: Switch to dark mode
+    - media: "(prefers-color-scheme: dark)"
+      scheme: slate
+      primary: custom
+      accent: custom
+      toggle:
+        icon: material/brightness-4
+        name: Switch to light mode
+
+extra_css:
+  - assets/omnipath-theme.css
+
+plugins:
+  - search
+  - mkdocstrings:
+      handlers:
+        python:
+          paths: ["."]
+          options:
+            show_source: false
+            show_root_heading: true
+
+nav:
+  - Home: index.md
+
+markdown_extensions:
+  - pymdownx.highlight
+  - pymdownx.superfences
+  - pymdownx.tabbed:
+      alternate_style: true
+  - admonition
+  - toc:
+      permalink: true