feat(server): add badge for overall status of status-page

[sjoukedv]

Description

Fixes #1616

Adds an API route /api/status-page/:slug/badge which shows the badge similar to the overall status on the status page itself.

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas
  (including JSDoc for methods)
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)

Screenshots (if any)

e.g. /api/status-page/test/badge?label=<status-page> returns the following:

• Up,
• Down,
• Degraded,
• Maintenance,

I wish badge-maker supported SVG as messages so that we can use the same font-awesome icon as the badge label

[chakflying]

I think you don't need to include the yarn.lock file.

[juzhiyuan]

The logic is clear to me 🙏

[sjoukedv]

I think you don't need to include the yarn.lock file.

My bad that lockfile slipped in there.

[sjoukedv]

I removed the lockfile and added yarn.lock to .gitignore as you commited the npm lockfile in this repo

[sjoukedv]

@louislam can you review/merge this?

[louislam]

@louislam can you review/merge this?

Thanks for the pr. Tested and it is working.