Fix getting started button link

[Meschreiber]

Just noticed these lead to 404s. I believe an absolute link needs to be used for ButtonLinks (didn't notice any others in the ios docs)

[svc-apollo-docs]

✅ Docs Preview Ready

Configuration

{
  "repoOverrides": {
    "apollographql/apollo-ios-dev@main": {
      "remote": {
        "owner": "Meschreiber",
        "repo": "apollo-ios-dev",
        "branch": "ms/fix-link"
      }
    }
  }
}

Name	Link
Commit	7b8e722
Preview	https://www.apollographql.com/docs/deploy-preview/1ec67018c1e4691bcff4
Build ID	1ec67018c1e4691bcff4
File Changes	0 new, 1 changed, 0 removed * (developer-tools)/ios/(latest)/index.mdx
Pages	1

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