Add pagination support

[swapagarwal]

Currently, the website takes a lot of time to load!

[souvikbasu]

yeah this is the major change needed atm.
There are two bottlenecks for page load time, lack of pagination and dynamic loading of component json based on user selection.
Need to fix pagination first. Shall size of page be determined by the viewport size or fixed at say 12 items?

[souvikbasu]

@swapagarwal please let us know if you would want to take this up
I have added dynamic import as a separate issue #143