feat(blogs): added functionality to approve or discard blogs by admin

[rohansen856]

Work done in this PR:

• added a new field approved in blogs model in application/blog/models.py
• updated the admin dashboard and added a responsive blogs table to show pending blogs for approval or discarding in templates/adminportal/index.html
• added new route to approve blogs in applications\blog\urls.py

Proof of work:

Dashboard._.Alumni.Connect.-.Google.Chrome.2024-07-19.18-32-58.mp4

in case no blogs are awaiting approval:

final notes:

file changes

1. Frontend: templates/adminportal/index.html
2. Backend:
   • applications/adminportal/views.py
   • applications/blog/models.py
   • applications/blog/urls.py
   • applications/blog/views.py
3. the demidata I used:
   blogs = [
   {"id": 1, "title": "hello this is title 1", "description": "description very very short though"},
   {"id": 2, "title": "hello this is title 2", "description": "description very very short though"},
   {"id": 3, "title": "hello this is title 3", "description": "description very very short though"},
   {"id": 4, "title": "hello this is title 4", "description": "description very very short though"},
   {"id": 5, "title": "hello this is title 5", "description": "description very very short though"},
   ]

@SamakshAgarwal1112 Please let me know if any more changes are required