Add Recent Searches to improve the search experience

**Is your feature request related to a problem? Please describe.**
When using the search bar, users often end up searching for the same things again and again like the same projects, mentors, or issues. Right now, the search box doesn’t remember anything, so users have to re-type the same queries every time

**Describe the solution you'd like**
It would be really helpful to add a Recent Searches section to the search bar
- When a user presses Enter or selects a search result, the search term gets saved in localStorage
- The next time the user clicks on the search bar, a Recent Searches list appears below it
- This list can show the last few searches (4-5)
- There should also be an option to remove individual items

**Are you going to work on implementing this?**

- [x] Yes
- [ ] No