Remove Chowdown (unmaintained since February 2022) (#210)

- it is a configuration for the Jekyll static site generator, which makes it unfit for the list as we don't list static site generators
- ref. #1
- alternatives exist

software/chowdown.io.yml

@@ -1,13 +0,0 @@
-name: Chowdown.io
-website_url: https://chowdown.io/
-description: Simple recipes in Markdown format.
-licenses:
-  - Unlicense
-platforms:
-  - Ruby
-tags:
-  - Recipe Management
-source_code_url: https://github.com/clarklab/chowdown
-stargazers_count: 587
-updated_at: '2022-02-17'
-archived: false