Remove `Sysadmin` list

The repo has been archived.

Closes #1904

readme.md

@@ -607,7 +607,6 @@
 	- [Datasets](https://github.com/jdorfman/awesome-json-datasets#readme)
 - [CSV](https://github.com/secretGeek/awesomeCSV#readme) - A text file format that stores tabular data and uses a comma to separate values.
 - [Discounts for Student Developers](https://github.com/AchoArnold/discount-for-student-dev#readme)
-- [Sysadmin](https://github.com/n1trux/awesome-sysadmin#readme)
 - [Radio](https://github.com/kyleterry/awesome-radio#readme)
 - [Awesome](https://github.com/sindresorhus/awesome#readme) - Recursion illustrated.
 - [Analytics](https://github.com/onurakpolat/awesome-analytics#readme)