Add mkdocs minimal configuration

docs/index.md

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+# Welcome to MkDocs
+
+For full documentation visit [mkdocs.org](https://www.mkdocs.org).
+
+## Commands
+
+* `mkdocs new [dir-name]` - Create a new project.
+* `mkdocs serve` - Start the live-reloading docs server.
+* `mkdocs build` - Build the documentation site.
+* `mkdocs -h` - Print help message and exit.
+
+## Project layout
+
+    mkdocs.yml    # The configuration file.
+    docs/
+        index.md  # The documentation homepage.
+        ...       # Other markdown pages, images and other files.

docs/stylesheets/extra.css

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+[data-md-color-scheme="pysr"] {
+    --md-primary-fg-color:        #C13245;
+    --md-primary-fg-color--light: #D35364;
+    --md-primary-fg-color--dark:  #982736;
+  }

mkdocs.yml

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+site_name: PySR
+theme:
+  name: material
+  palette:
+    # Light mode:
+    - scheme: pysr
+  logo: assets/pysr_logo.svg
+  icon:
+    repo: fontawesome/brands/github-alt
+
+extra:
+  homepage: https://astroautomata.com/PySR
+
+extra_css:
+  - stylesheets/extra.css
+
+repo_url: https://github.com/MilesCranmer/PySR