feat(services): support multiple markdown files

[gjuchault]

Motivation

This closes #242

The goal of this PR is to introduce "extra files" — documentation. I think this could be valuable to have files from "repository starter" like CONTRIBUTING.md, or more domain-oriented files like feature descriptions, etc.

Some points that can be discussed:

• I included a commit to set a volta pin in the package.json to ease development phase (but I can drop this from the PR if you want)
• I included a commit to fix the start-catalog-locally command that was failing
• Should this PR also support nested files? I think this could bring visual complexity (how to display them in the sidebar?)

Have you read the [Contributing Guidelines on pull requests]

Yes

[changeset-bot]

🦋 Changeset detected

Latest commit: cfd35c8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@eventcatalog/types	Patch
@eventcatalog/core	Patch

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2 Ignored Deployments

Name	Status	Preview	Comments	Updated (UTC)
eventcatalog-docs	⬜️ Ignored (Inspect)	Visit Preview		May 2, 2024 11:47am
eventcatalog-example	⬜️ Ignored (Inspect)	Visit Preview		May 2, 2024 11:47am

[anaelChardan]

Would be awesome to have this one!