Add documentation page using DevSeed's mkdocs format (#19)

* Add devseed mkdocs basic template
* Add docs GitHub Actions CI workflow
* Add placeholder for tools & agents
* Add mkdocstrings to automatically create documentation from code
* Fix RUF022 `__all__` is not sorted
* Deploy to GitHub Pages from artifacts

Also move permissions from workflow-level to job-level.

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Co-authored-by: Wei Ji <23487320+weiji14@users.noreply.github.com>

docs/agents/index.md

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+# Geo Assistant Agent
+
+The Geo Assistant agent is a LLM-powered agent that can answer questions and perform tasks related to locations and geographic data.

docs/index.md

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+# Geo Assistant
+
+A geographic assistant that helps answer questions and perform tasks related to locations and geographic data.

docs/overrides/stylesheets/extra.css

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+:root,
+[data-md-color-scheme="default"] {
+  /* --md-heading-font: "Oswald"; */
+  --md-primary-fg-color: #cf3f02;
+  --md-default-fg-color: #443f3f;
+  --boxShadowD: 0px 12px 24px 0px rgba(68, 63, 63, 0.08),
+    0px 0px 4px 0px rgba(68, 63, 63, 0.08);
+}
+body {
+  margin: 0;
+  padding: 0;
+  /* font-size: 16px; */
+}
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  font-family: var(--md-heading-font);
+  font-weight: bold;
+}
+.md-typeset h1,
+.md-typeset h2 {
+  font-weight: normal;
+  color: var(--md-default-fg-color);
+}
+.md-typeset h3,
+.md-typeset h4 {
+  font-weight: bold;
+  color: var(--md-default-fg-color);
+}
+.md-button,
+.md-typeset .md-button {
+  font-family: var(--md-heading-font);
+}
+.md-content .supheading {
+  font-family: var(--md-heading-font);
+  text-transform: uppercase;
+  color: var(--md-primary-fg-color);
+  font-size: 0.75rem;
+  font-weight: bold;
+}

docs/tools/index.md

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+# Tools
+
+List of tools available to the agent.
+
+::: geo_assistant.tools.get_place
+
+::: geo_assistant.tools.get_search_area
+
+::: geo_assistant.tools.fetch_naip_img
+
+::: geo_assistant.tools.summarize_sat_img