Smarthub: renaming Smarthub to Attekmi

[SmartHubSolutions]

🏷 Type of documentation

• text edit only (wording, typos)

📋 Checklist

• Related pull requests in prebid.js or server are linked -> Paste link in this list or reference it on the PR itself

We change the name from Smarthub to Attekmi but leave the biddercode 'smarthub'

Prebid.js PR prebid/Prebid.js#12432
Prebid-server PR prebid/prebid-server#4047

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[patmmccann]

please also submit attekmi.md in this pr similar to this: https://github.com/prebid/prebid.github.io/pull/5704/files which documents a new alias

this means people will find your documentation no matter which name they look for and both names will appear on the download page

[bretg]

I agree with Patrick here. Renaming adapters is common, but can be confusing to publishers who can't find documentation for the name they're familiar with. The smarthub.md file can say "please note that SmartHub has been renamed to Attekmi" or something like that.

[SmartHubSolutions]

I added attekmi.md and add note about rebranding in smarthub.md