feat: use github pages and jekyll for docs

docs/devs/api.md

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+---
+layout: default
+parent: For developers
+title: API reference
+nav_order: 3
+---
+
+
+API reference
+=============
+
+Coming soon...

docs/devs/development.md

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+---
+layout: default
+title: For developers
+nav_order: 3
+has_children: true
+---
+
+
+For developers
+==============
+
+Thanks for contributing :)

docs/devs/extensions.md

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+---
+layout: default
+parent: For developers
+title: Making extensions
+nav_order: 2
+---
+
+
+Making extensions
+=================
+
+Coming soon...

docs/devs/installation.md

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+---
+layout: default
+parent: For developers
+title: Installation
+nav_order: 1
+---
+
+
+Installation
+============
+
+LNbits uses [Flask](http://flask.pocoo.org/).
+
+
+Application dependencies
+------------------------
+
+The application uses [Pipenv][pipenv] to manage Python packages.
+While in development, you will need to install all dependencies (includes packages like `black` and `flake8`):
+
+    $ pipenv shell
+    $ pipenv install --dev
+
+
+Running the server
+------------------
+
+    $ flask run
+
+There is an environment variable called `FLASK_ENV` that has to be set to `development`
+if you want to run Flask in debug mode with autoreload
+
+
+[pipenv]: https://docs.pipenv.org/#install-pipenv-today