MT-22695: Add Go SDK to the Go integration guide and Guides overview

[Rabsztok]

Motivation

https://railsware.atlassian.net/browse/MT-22695

Changes

• Restructure the Go integration guide to match ruby-integration.md: SDK overview with feature list, installation (go get github.com/mailtrap/mailtrap-go), minimal send example, and API-token hint; SMTP and RESTful API sections retained
• Add a net/smtp fallback sample to the SMTP section, since the SDK is API-only
• Add a Go SDK card to the Guides overview (after Python, before the framework cards) and drop Go from the "additional languages" sentence

How to test

• Open the Guides overview — verify the Go SDK card appears alongside the other SDK cards
• Open the Go integration guide — verify the SDK section, installation command, and minimal example render correctly and the SMTP/RESTful sections are still present

Summary by CodeRabbit

• Documentation
  • Added Go to the list of officially supported SDK integrations.
  • Expanded the Go integration guide with installation requirements, SDK setup steps, and a complete working example.
  • Added a dependency-free SMTP integration example using Go’s standard library.
  • Updated SDK navigation links and reorganized REST API guidance for clearer flow.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: efe33a91-3101-4b86-9c36-5a9494d27eef

📥 Commits

Reviewing files that changed from the base of the PR and between ceb0877 and ade1992.

📒 Files selected for processing (1)

• guides-and-tips/sdk/go-integration.md

📝 Walkthrough

Walkthrough

The Go integration guide was expanded with SDK installation and sending instructions, a minimal API example, and a standard-library SMTP example. The Official SDKs catalog now includes Go, while the additional-language navigation list contains Elixir, Scala, and Perl.

Changes

Go integration documentation

Layer / File(s)	Summary
Go SDK and SMTP guide guides-and-tips/sdk/go-integration.md	Adds Go SDK setup requirements, installation instructions, a minimal Send example, and a net/smtp example using smtp.SendMail.
Official SDK catalog update guides-and-tips/README.md	Adds a Go SDK card, updates card attributes, and removes Go from the additional-language navigation sentence.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding Go SDK documentation to the Go integration guide and Guides overview.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@guides-and-tips/sdk/go-integration.md`:
- Line 125: Replace the generic “here” anchor text in the SMTP integration link
with descriptive text such as “SMTP integration guide,” while preserving the
existing destination URL.
- Around line 7-17: Update the Go integration document’s heading hierarchy: move
the page title into YAML frontmatter, remove the standalone “# Go” heading,
promote “Overview” and “Email API/SMTP for Go” to H1 headings, and format “SDK
integration,” “Installation,” “Minimal Example,” “SMTP integration,” and
“RESTful API integration” as H2 headings.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: fcdd6117-6e9a-4282-9b09-fba54dfd2c6c

📥 Commits

Reviewing files that changed from the base of the PR and between 1a80fd4 and ceb0877.

📒 Files selected for processing (2)

• guides-and-tips/README.md
• guides-and-tips/sdk/go-integration.md