Add NestBot home page Contribute section

[arkid15r]

Describe the solution you'd like
Extend buttons w/ Contribute to show simple project issues page. Refactor and reuse slack/commands/contribute.py code.

[AbhayTopno]

@arkid15r can you assign this to me please

[nitinawari]

Can i work on this ? I have previous experience with nest bot

[nitinawari]

@AbhayTopno you started working on it ?

[AbhayTopno]

Yes , I'm

[nitinawari]

@AbhayTopno, apologies for the confusion, but this task has become quite simple while resolving #428. All we need to do is:

Add a contribution button to the header block.
In home_action, include:

`case "view_contribute_action": 
    blocks = format_contribute(  
        search_query="",  
        limit=10,  
        presentation=home_presentation  
    )  

Additionally, we should extract duplicate code into slack/common/handler.

If you complete this task by old method , it will likely be overwritten by my changes to #428. How should we proceed? Should I handle this as part of my task, if you’re okay with that?"