Adding one-click deploy template for RepoCloud.io

[cosark]

Link to one-click installation template enabling users to affordably deploy and scale SerpBear on RepoCloud's efficient cloud hosting platform. Placing this link on the readme qualifies the SerpBear team to earn 25% recurring referral commission.

[towfiqi]

@cosark Thanks for the contribution, but sorry to say that the pull request as all ther other 1 click deploy services are added in the docs and not directly in the readme. Please create a simple doc explaining how to deploy it to repocloud.io and reply it as a comment in this pull request and we will add it to the docs. You can check out the pikapods doc for inspiration: https://docs.serpbear.com/deployment/deploying-to-pikapods-1-click