Use IndexedDB efficiently

[eshaan7]

At the moment, we only store the last 10 recent scans requested by the user in indexedDB. We could extend this to store the list of jobs and the analyzer configuration perhaps even more, this has many advantages:

• less load on the backend/Database.
• application can be served offline (in case of poor or no network connection)
• fetching from indexedDB is obviously faster than making a http call to the Django API so application loads faster.