Add imatrix computing tips

#746

As a follow-up to https://huggingface.co/mradermacher/Meta-Llama-3.1-70B-i1-GGUF/discussions/1 and, hopefully, partial redemption for not having located the FAQ before, here's some extra imatrix computing tips that would be nice to add

Closes #745

mradermacher changed pull request status to merged

Looks good :)

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