Embedded new tab page to fix Chrome breaking the default on search change

[jkowskib]

This is a response to both my own experience and something mentioned in [https://github.com//issues/13](this issue).

For Chrome, when the Kagi extension is installed it disables Google search as expected. However because of some oversite in Chrome or by design, this messes up the default chrome://newtab page and completely removes all of the search bar and logo leaving behind a broken looking webpage that contains only the quick links. Here is an example I did to show it.

To remedy this I have created an embedded offline page in the newtab folder, its simple for now as this is just a proposal to see how everyone feels about this. I modified the manifest to include a chrome_url_overrides that will set the /newtab/index.html to overwrite the default new tab. I would have simply made it load the Kagi website, but after more consideration, its probably better to keep it offline so the new tab page does not break if the user looses internet. Hence making a embedded page. Here is a sample of it.

Basically a copy of the Kagi search page. I used all icons and graphics from the official Kagi page to ensure there is no issue of who owns the icons and such. Personally I would like this, the broken Chrome page is strange to look at. But if its out of scope I understand.