DOC-1063: Update Motorhead credentials to medium tier template

[freakwriter]

Remove prerequisites section, convert short bullet point list to detailed numbered list.

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Overall readability score: 43.09 (🟢 +0.01)

File	Readability
motorhead.md	48.86 (🟢 +13.23)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [motorhead.md](https://github.com/n8n-io/n8n-docs/blob/fb093961c66719477811cd65c6abcd3d4151fbf6/docs/integrations/builtin/credentials/motorhead.md "docs/integrations/builtin/credentials/motorhead.md") | 48.86 | 34.63 | 9.68 | 14.3 | 15.06 | 7.76   | 🟢 +13.23 | 🟢 +14.79 | 🟢 +1.39 | 🟢 +1.1 | 🟢 +1.84 | 🟢 +1.31 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 43.09 | 34.81 | 11.67 | 14.88 | 14.37 | 8.54   | 🟢 +0.01 | 🟢 +0.01 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0

View metric targets

Metric | Range | Ideal score --- | --- | --- Flesch Reading Ease | 100 (very easy read) to 0 (extremely difficult read) | 60 Gunning Fog | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Auto. Read. Index | 6 (very easy read) to 14 (extremely difficult read) | 8 or less Coleman Liau Index | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Dale-Chall Readability | 4.9 (very easy read) to 9.9 (extremely difficult read) | 6.9 or less