Add docs for custom NPM registry support

[netroy]

main PR

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[github-actions[bot]]

Overall readability score: 42.58 (🟢 +0)

File	Readability
nodes.md	48.49 (🟢 +0.54)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [nodes.md](https://github.com/n8n-io/n8n-docs/blob/07eec7834361c70a45b1cc68ad45cd660842f78a/docs/hosting/configuration/environment-variables/nodes.md "docs/hosting/configuration/environment-variables/nodes.md") | 48.49 | 40.75 | 11.32 | 13.1 | 14.14 | 8.26   | 🟢 +0.54 | 🟢 +0.4 | 🟢 +0.31 | 🟢 +0.1 | 🔴 -0.05 | 🔴 -0.04 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 42.58 | 34.43 | 11.74 | 14.97 | 14.43 | 8.58   | 🟢 +0 | 🟢 +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