fix: remove demo projects

_data/projects.yaml

@@ -5,14 +5,6 @@
   link: https://jihulab.com/solecnu/hperf
   description: Efficient measuerment to provide reliable data for workload characterization and bottleneck identification. 
 
-- title: Cool Dataset
-  subtitle: a subtitle
-  group: featured
-  image: images/projects/default.png
-  link: https://github.com/
-  description: Lorem ipsum _dolor sit amet_, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
-  repo: greenelab/lab-website-template
-
 - title: Cool Tutorial
   subtitle: a subtitle
   group: normal