[FIX] Manifest URL

[anonhostpi]

Corrects the manifest URL to use the same URL that Obsidian does, which is the one on the Release Asset

Describe your changes

• changes fetchReleases() to populate releases with a manifest_url
• changes fetchManifest() to accept a manifest_url

Related Issues

Fixes #12

Checklist before requesting a review

• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation N/A
• My code fixes the feature discussed in Related Issues

[anonhostpi]

I've already run your workflows on my fork: anonhostpi#2

• they ran successfully.

I've also already tested the changes on my instance against anonhostpi/obsidian-exposed-apis - 0.0.3-f (the tag that caused problems for #12)

[4Source]

Ready to ship?

[anonhostpi]

Yup