[infra] Better support for RSS and blog pages

[chalin]

• Contributes to Blog updates and enhancements 25Q1 #5902
• Fixes Create 2025 blog section and adjust redirects #5873. (Re)fixes:
  • RSS for website blog #3740
  • Blog RSS feed is empty #4440
• Supports RSS feeds for the homepage of each locale, and the blog landing page. Each RSS feed is for the entire site or section, as appropriate.
• Limits the number of entries to 20, which seems typical.
• Fixes the config for all locales
• Eliminates the need for blog redirects, which needed to be updated each year. Replaces the redirect hack by a JS solution that will open the 2025 and 2024 blog subsections in the left nav. I'll adjust the code later so that we don't have to update this each year.

Preview:

• https://deploy-preview-6002--opentelemetry.netlify.app
• https://deploy-preview-6002--opentelemetry.netlify.app/blog
• https://deploy-preview-6002--opentelemetry.netlify.app/blog/2024

RSS feeds:

• https://deploy-preview-6002--opentelemetry.netlify.app/index.xml
• https://deploy-preview-6002--opentelemetry.netlify.app/fr/index.xml
• https://deploy-preview-6002--opentelemetry.netlify.app/blog/index.xml
• https://deploy-preview-6002--opentelemetry.netlify.app/pt/blog/index.xml

/cc @dmathieu

[dmathieu]

How about adding link tags with the feed's address?

[chalin]

How about adding link tags with the feed's address?

The link tag is there, e.g.: <link>https://deploy-preview-6002--opentelemetry.netlify.app/</link> for /index.xml. From the blog feed:

<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">
<channel>
<title>Blog on OpenTelemetry</title>
<link>https://deploy-preview-6002--opentelemetry.netlify.app/blog/</link>
<description>Recent content in Blog on OpenTelemetry</description>
...

[chalin]

/cc @austinlparker

[dmathieu]

The per-language feeds don't seem to be linked when I visit a page such as https://deploy-preview-6002--opentelemetry.netlify.app/pt/blog/ though.

[chalin]

The per-language feeds don't seem to be linked when I visit a page such as https://deploy-preview-6002--opentelemetry.netlify.app/pt/blog/ though.

Right. I'm not quite satisfied with the way the non-en blogs are setup, and so they are likely to be reworked. For that reason I had disabled the blog RSS feeds for non-en locales. I guess that I can leave the active in the meantime. Let me do that.