feat(actions): unify page action buttons

[sanderson]

This PR sets out to accomplish the following:

• Simplify the Telegraf plugin md generation by automatically generating links to source code
• Provide a download mechanism for downloading files from an external source (used for downloading sample.conf files for each plugin.
• Unify the styles of the added Telegraf actions and the existing LLM format selector:

Checklist

• Rebased/mergeable
• Local build passes (npx hugo --quiet)

[jstirnaman]

Looks great! 1 suggestion to improve DX. Also, any suggestions/documentation on when we should or shouldn't use the page-actions components would be helpful.

[sanderson]

Also, any suggestions/documentation on when we should or shouldn't use the page-actions components would be helpful.

I'll add docs for this, but in my mind, these should be used for actions that are general, but still specific to the current page. For example, in the Flux stdlib, we could use these to link to package source code. Or in the InfluxDB 3 plugin library, we could link to the plugin source. Etc.

These shouldn't really be used to for a single piece of functionality on a single page.

[github-actions]

Vale Style Check Results

Metric	Count
Errors	0
Warnings	7
Suggestions	18

Warnings (7)

File	Line	Rule	Message
.github/instructions/layouts.instructions.md	55	write-good.TooWordy	'Implement' is too wordy.
DOCS-PAGE-ACTIONS.md	7	write-good.TooWordy	'it is' is too wordy.
DOCS-PAGE-ACTIONS.md	28	write-good.TooWordy	'all of' is too wordy.
DOCS-PAGE-ACTIONS.md	35	write-good.Passive	'is derived' may be passive voice. Use active voice if you can.
DOCS-PAGE-ACTIONS.md	64	write-good.Weasel	'usually' is a weasel word!
DOCS-PAGE-ACTIONS.md	87	write-good.Weasel	'usually' is a weasel word!
DOCS-PAGE-ACTIONS.md	90	write-good.Weasel	'usually' is a weasel word!

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✅ Check passed

[sanderson]

@jstirnaman Added page actions documentation: https://github.com/influxdata/docs-v2/pull/7216/changes#diff-994d05b1e7a6fa336f6d39ebe07188b98d753f4cf83db2f97319d6908727626c