chore(docs): migrate deprecated Hugo syntax for v0.148.2(latest) support

[niladrix719]

What this PR does:

migrate deprecated Hugo syntax for v0.148.2(latest) support

Why we need it:

Hugo v0.148.2 introduces breaking changes in templating syntax, so the templates were updated to ensure the docs site builds without errors

---

[Added] Fixes #4902

[khanhtc1202]

Nice catch, thank you 👌

[t-kikuc]

@niladrix719
[ask] We use 0.128.0 for now. Is the new syntax available for 0.128.0 too?

pipecd/.github/workflows/publish_site.yaml

Lines 28 to 30 in 6b02f2c

	with:
	hugo-version: '0.128.0'
	extended: true

[niladrix719]

@niladrix719 [ask] We use 0.128.0 for now. Is the new syntax available for 0.128.0 too?

I tested the site locally with Hugo v0.128.0, and the updated syntax works fine. We could consider updating the version in the workflow as well — wdyt?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.52%. Comparing base (12361db) to head (ce26f75).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6099       +/-   ##
===========================================
+ Coverage   28.47%   38.52%   +10.05%     
===========================================
  Files         536       35      -501     
  Lines       57137     3509    -53628     
===========================================
- Hits        16267     1352    -14915     
+ Misses      39602     2088    -37514     
+ Partials     1268       69     -1199     

Flag	Coverage Δ
.	?
.-pkg-app-pipedv1-plugin-analysis	62.85% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes	?
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	?
.-pkg-app-pipedv1-plugin-scriptrun	?
.-pkg-app-pipedv1-plugin-terraform	?
.-pkg-app-pipedv1-plugin-wait	35.51% <ø> (ø)
.-pkg-app-pipedv1-plugin-waitapproval	?
.-pkg-plugin-sdk	51.40% <ø> (ø)
.-tool-actions-gh-release	19.23% <ø> (ø)
.-tool-actions-plan-preview	25.30% <ø> (ø)
.-tool-codegen-protoc-gen-auth	0.00% <ø> (ø)

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[khanhtc1202]

LGTM 👍

[t-kikuc]

Let's go to 148

[t-kikuc]

Let's merge this after releasing v0.53.0 next week.

[t-kikuc]

This PR fixes #4902

[niladrix719]

Sorry, I think the site publish CI is failing after this PR (since the docs-v0.53.x changes were missed). Hopefully, this fixes it: #6140

cc @khanhtc1202 @t-kikuc