Add Naxios as an option to integrate-contracts.md

[wpdas]

Add Naxios as an option to set up Wallet and Contract integration.

[frol]

@wpdas Sorry for jumping in, but I'd like to invite you to participate in the Race of Sloths - a fun and gamified open-source contributions program. Consider mentioning @race-of-sloths user in your github comment or PR description to join!

See how the flow works here: near/nearcore#11778

[gagdiez]

@race-of-sloths: score 2

[race-of-sloths]

@gagdiez Thank you for calling!

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