Fix versioning issues with OAS and insomnia buttons

[lena-larionova]

Description

Fixing two issues with our Gateway Admin EE and OSS specs:

1. The version number in the specs for 3.9 and latest is incorrect, both should be 3.9 but are showing 3.8. The content of the files are correct for 3.9 though, I tracked down the file histories and it just looks like the version number update was missed.
2. The insomnia buttons to the versioned specs are incorrect. Easiest solution, added a shortcode that we can access via {{page.short_version}}.

Specs are already updated in Konnect Dev Portal.

Tested the buttons, they all import the correct specs. Note that the filename format changed in 3.8, so that's why I had to version tag the URLs.

Issue reported on Slack.

Testing instructions

Preview link:

Checklist

• Review label added
• Conditional version tags added, if applicable.

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[mheap]

You can dynamically add the short version entry if you prefer

e.g.

docs.konghq.com/app/_plugins/generators/pages/version_data.rb

Line 51 in dd680e0

@page.data['major_minor_version'] = release.value.gsub('.x', '').gsub('.', '')

[lena-larionova]

You can dynamically add the short version entry if you prefer

e.g.

docs.konghq.com/app/_plugins/generators/pages/version_data.rb

Line 51 in dd680e0

@page.data['major_minor_version'] = release.value.gsub('.x', '').gsub('.', '')

❗ Didn't know this existed; couldn't find it it in the versions file. Good thing this didn't take me very long 😄 I'll replace with that.