Correctly display inline code blocks-2

[JakubAndrysek]

Fixes the issue where inline code blocks (i.e. in a details section) don't display correctly.

This is done by first outputting all code sections as plain code blocks (using ``` without a language) and then applying a filter in the jinja2 templates that adds the active language to any plain code blocks.

fixes #79

PR by @r-braun - #96

[sourcery-ai]

Hey @JakubAndrysek - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Docstrings: all looks good

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