add support for mkdocs

Author: liamcottle

docs/_assets/meshcore_tm.svg

@@ -0,0 +1,11 @@
+:root {
+    --md-primary-fg-color: #1F2937;
+    --md-primary-fg-color--light: #1F2937;
+    --md-primary-fg-color--dark: #1F2937;
+    --md-accent-fg-color: #1F2937;
+}
+
+/* hide git repo version */
+.md-source__fact--version {
+    display: none;
+}

docs/_stylesheets/extra.css

@@ -0,0 +1,13 @@
+# Welcome
+
+Welcome to the MeshCore documentation.
+
+## Building and viewing Docs
+
+```
+pip install mkdocs
+pip install mkdocs-material
+```
+
+* `mkdocs serve` - Start the live-reloading docs server.
+* `mkdocs build` - Build the documentation site.

docs/index.md

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+site_name: MeshCore Docs
+site_url: https://meshcore-dev.github.io/meshcore/
+site_description: Documentation for the open source MeshCore firmware
+
+repo_name: meshcore-dev/meshcore
+repo_url: https://github.com/meshcore-dev/meshcore/
+edit_uri: edit/main/docs/
+
+theme:
+  name: material
+  logo: _assets/meshcore_tm.svg
+  features:
+    - content.action.edit
+    - content.code.copy
+    - search.highlight
+    - search.suggest
+    - toc.integrate
+
+extra_css:
+  - _stylesheets/extra.css