chore: Update polly docs URL

[maciaszczykm]

Plural Flow: docs
Plural Preview: docs

[linear]

PROD-4459 all codebases should have docker-compose files capable of building and also executing tests

[plural-copilot]

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⚡ Service	docs-pr-585 (4 / 5 ready)
☁️ Cluster	plural (eks)
Commit sha	f229c8f
Plural URL	https://console.mgmt.plural.sh/cd/clusters/446acdef-8524-425a-a49f-5336a...
🔍 Logs URL	https://console.mgmt.plural.sh/cd/clusters/446acdef-8524-425a-a49f-5336a...
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Preview Link	Preview

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[greptile-apps]

Greptile Summary

This PR updates documentation references to the polly package to reflect its new location in the pluralsh/console monorepo. Five _Implementation_ links in pages/plural-features/service-templating/supporting-liquid-filters.md are updated from github.com/pluralsh/polly/template.* to github.com/pluralsh/console/go/polly/template.*, affecting the dfault, indent, nindent, slice, and ternary filters. All changes are purely mechanical string substitutions with no logic or functionality alterations.

Confidence Score: 5/5

• This PR is safe to merge — it applies purely mechanical path updates to reflect the polly package's relocation with no logic changes.
• The PR consists of five simple, consistent string substitutions in a single documentation file, updating package import paths from the old pluralsh/polly repository to the new location within the pluralsh/console monorepo. All updates are identical in pattern and pose no functional risk.
• No files require special attention.

_{Last reviewed commit: f229c8f}