renamed config/options and get_md_help()

website/docs/config.md

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+---
+nav_order: 55
+has_children: true
+---
+
+# Configuration
+
+Aider has many options which can be set with
+command line switches.
+Most options can also be set in an `.aider.conf.yml` file
+which can be placed in your home directory or at the root of
+your git repo. 
+Or via environment variables like `AIDER_xxx`,
+as noted in the [options reference](options.html).
+
+Here are 3 equivalent ways of setting an option. First, via a command line switch:
+
+```
+$ aider --dark-mode
+```
+
+Or, via an env variable:
+
+```
+export AIDER_DARK_MODE=true
+```
+
+Or in the `.aider.conf.yml` file:
+
+```yaml
+dark-mode: true
+```
+