Implement a metric dashboard

[hardiksurana]

Is your feature request related to a problem? Please describe.
None.

Describe the solution you'd like
Retrieve the following numbers and display them on the splash page:

1. Number of artifacts of each type (publication, dataset, code, etc.).
2. Number of ratings created so far.
3. Number of reviews created so far.
4. Most viewed artifact.
5. Most searched keywords.

Show these metrics for each user in their dashboard:

1. My artifacts
2. My favorites - Done
3. My ratings/reviews/comments - recent activity

Describe alternatives you've considered
None.

Additional context
Add more metrics to the dashboard as per team discussion.