feat(rss feed): added xslt for rss feed

[Xebec19]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

I have added an XSLT file for the RSS feed as was required in issue #9197

User can enable this feature by adding below property in feedOptions

xsl: {
                enable: true,
                rssStylesheet: 'custom-rss.stylesheet.xslt',
                atomStylesheet: 'custom-atom.stylesheet.xslt'
}

User need to save her custom stylesheets in static folder. If they do not give a custom stylesheet, default stylesheets would be used

Test Plan

I have added two snapshots to test default and custom stylesheets

Test links

Deploy preview: https://deploy-preview-9252--docusaurus-2.netlify.app/

Before:

• https://docusaurus.io/blog/atom.xml
• https://docusaurus.io/blog/rss.xml

After (Default xslt):

• https://deploy-preview-9252--docusaurus-2.netlify.app/blog/atom.xml
• https://deploy-preview-9252--docusaurus-2.netlify.app/blog/rss.xml

After (Custom xslt)

• https://deploy-preview-9252--docusaurus-2.netlify.app/tests/blog/rss.xml
• https://deploy-preview-9252--docusaurus-2.netlify.app/tests/blog/atom.xml

Related issues/PRs

fix #9197

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Build	Status	Details	Updated (UTC)
default (Inspect)	🧿 Changes detected (Review)	2 changes	Sep 19, 2023, 1:39 PM

[slorber]

Thanks

That looks like a good start but is not enough to be merged for a few reasons.

---

In case it wasn't clear: the goal is not to add XSLT just for our own website, but to build it as a feature for any Docusaurus site to have by default.

It needs to be modular and it needs to work well out of the box on any Docusaurus site, without conflicting with existing user static assets. My suggestion would be to output the xslt/css next to the feeds, under /blog/ for example, so that it is namespaced and we can use 2 blogs with different CSS/XSLT files.

---

The Atom feed is broken, see:

• Before https://docusaurus.io/blog/atom.xml
• After: https://deploy-preview-9252--docusaurus-2.netlify.app/blog/atom.xml

---

Also I don't think it looks super great as is. My suggestion would be to steal/adapt XSLT/CSS from what https://darekkay.com/blog/rss-styling/ is using. We'll improve from there.

[Xebec19]

OK I will do the requested changes