Add subtitle field to feed and item fields

[rbren]

Summary

This PR adds support for parsing the subtitle field in RSS feeds.

Changes

• Added subtitle field to fields.feed array - enables parsing of subtitle elements at the feed level
• Added subtitle field to fields.item array - enables parsing of subtitle elements at the item level

Motivation

The subtitle field is a common RSS element that provides a secondary title or tagline for feeds and items. Previously, this field was only supported for iTunes podcast feeds (via itunes:subtitle), but the standard subtitle element was not being parsed. This change allows the parser to extract subtitle information from standard RSS feeds as well.

@rbren can click here to continue refining the PR

[rbren]

@openhand add an inline comment describing your changes

[rbren]

remove this one @OpenHands

[openhands-ai]

I'm on it! rbren can track my progress at all-hands.dev

[openhands-ai]

I've addressed the PR review comment by removing the subtitle field from the fields.item array in lib/fields.js (line 39).

Summary of changes:

• ✅ Removed 'subtitle' from fields.item array as requested by @rbren
• ✅ Kept 'subtitle' in fields.feed array (this was not requested to be removed)
• ✅ Changes committed and pushed to the add-subtitle-field-to-parser branch

Final PR diff (compared to master):
The PR now only adds subtitle to the feed-level fields, not item-level fields:

fields.feed = [
   ...
   'title',
   'description',
+  'subtitle',
   'author',
   ...

The changes have been pushed to update PR #299.

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