Blog: OTel Integrations Welcome! + badge

[chalin]

• Rather than add a "note" at the top of integration post, I propose that we add a distinctive badge
• This PR adds a blog post that introduces the badge, which we'll be able to use in other posts such as Add blog post about adopting OTel metrics in Cloud Foundry #3466 and Adds Tyk API Gateway blog post #3431
• Clicking the badge refers the reader back to this post.
• If you like the idea, I suggest we merge this. After I'll factor out the badge so that it can be reused in other posts via a shortcode.

Preview: https://deploy-preview-3485--opentelemetry.netlify.app/blog/2023/integrations/

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[cartermp]

Let's set this to be some time later this week.

[chalin]

Done. Publication date set to 11/08.

[chalin]

@svrnm - given that @cartermp has approved, I'm going to merge now so that I can work on the followup refactoring. Comments are still welcome.