DOC-1075: Update Calendly credentials to medium tier template

[freakwriter]

Remove prerequisites, add warning about webhooks only on paid plans, convert bullet points to much more detailed numbered list.

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Overall readability score: 43.2 (🔴 -0.01)

File	Readability
calendly.md	58.29 (🔴 -6.79)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [calendly.md](https://github.com/n8n-io/n8n-docs/blob/851356cb28e4e3dd91bdbea6f6bbe938bee37c6d/docs/integrations/builtin/credentials/calendly.md "docs/integrations/builtin/credentials/calendly.md") | 58.29 | 35.13 | 8.16 | 12.4 | 14.13 | 6.93   | 🔴 -6.79 | 🔴 -9.68 | 🟢 +0.26 | 🔴 -2.3 | 🔴 -2.15 | 🟢 +0.23 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 43.2 | 34.89 | 11.66 | 14.86 | 14.35 | 8.53   | 🔴 -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