Fixed a typo in home page url

[abhatikar]

[ghost]

An error occurred whilst building your landr site preview:

{
  "name": "TypeError",
  "message": "Cannot read property 'includes' of null",
  "stack": "TypeError: Cannot read property 'includes' of null\n    at hasDeployButton (/usr/src/app/node_modules/scrutinizer/lib/utils/markdown.js:462:19)\n    at module.exports (/usr/src/app/node_modules/scrutinizer/lib/plugins/deployButtons.js:34:26)"
}

[Bucknalla]

@phil-d-wilson this commit doesn't meet the linting requirement - will need to fix the commit message before the CI lets us merge