Browser: Add Brave and Mojeek to search engines

[Xexxa]

Browsers with own rendering engines is cool, so is search engines with their own indexes.

This PR adds Brave Search and Mojeek for some additional alternatives to Bing (DuckDockGo/FrogFind) and Google.

Both renders good enough in Browser(Gigablast did not so is not included).

[nico]

You might be a interested in https://seirdy.one/posts/2021/03/10/search-engines-with-own-indexes/

[Xexxa]

You might be a interested in https://seirdy.one/posts/2021/03/10/search-engines-with-own-indexes/

This was a great read, I know about some of the search engines but not all of them.

Also, Mojeek sorted under "Large indexes, good results" kinda confirms it's an good addition. Even if Brave Search is listed under "Semi-independent indexes" that's the only alternative search engine I've used at default for longer times because it's English results are really good.