Add a GitHub collaboration template for graph apps

[pomelo-nwu]

• add landing page
  
• custom property panel
  
• reference: https://github.com/GraphScope/demo-github

[yecol]

Sorry for overlooking something, but what is this issue for?

[pomelo-nwu]

@yecol Use the studio-components, studio-graph, and studio-driver packages provided by portal for front-end developers to implement an example of a GitHub collaboration network. This example can later serve as a promotional case study, allowing users to replicate it. It encompasses the entire process of graph data modeling, importing,queying, visualization, and application customization. lol