DOC-1000: Update WordPress credentials to more detailed step-by-step instructions

[freakwriter]

Summary of changes:

• Converted bullet points to numbered, detailed step-by-step instructions
• Split instructions to three separate subsections for readability.
• Verified all links work.

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[github-actions[bot]]

Overall readability score: 42.48 (🟢 +0.01)

File	Readability
wordpress.md	58.52 (🟢 +8.44)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [wordpress.md](https://github.com/n8n-io/n8n-docs/blob/f336c532e681e3464229239db7de9c4e33c5c5fa/docs/integrations/builtin/credentials/wordpress.md "docs/integrations/builtin/credentials/wordpress.md") | 58.52 | 36.55 | 7.28 | 12.7 | 15.28 | 6.76   | 🟢 +8.44 | 🔴 -0.31 | 🟢 +1.36 | 🟢 +0.8 | 🟢 +0.35 | 🟢 +1.4 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 42.48 | 34.34 | 11.76 | 14.99 | 14.43 | 8.58   | 🟢 +0.01 | 🟢 +0 | 🟢 +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