docs(guides): add two testcontainers intro guides (go and python)

[mdelapenya]

Description

Migrate the first two Testcontainers getting-started guides from testcontainers.com/guides into the Docker docs site:

• Getting started with Testcontainers for Go — multi-page guide with 4 chapters (create project, write tests, test suites, run tests). Code updated to testcontainers-go v0.41.0 API (postgres.Run(), CleanupContainer, BasicWaitStrategies()).
• Getting started with Testcontainers for Python — multi-page guide with 3 chapters (create project, write tests, run tests). Code updated to testcontainers-python 4.14.2 (fixed get_exposed_port() returning int).

Each guide appears as its own entry in the /guides/ listing with proper language and tag filters (testing-with-docker). Chapters render with stepper navigation in the sidebar.

Also adds:

• A testing-with-docker tag to data/tags.yaml
• A Claude skill (.claude/skills/testcontainers-guides-migrator/SKILL.md) that documents the repeatable migration process for the remaining 19 guides
• Links from content/manuals/testcontainers.md to the new guides
• Vale vocabulary entries for pgx, Micronaut, psycopg, pytest

All guide code was compiled and tests verified passing in containers with Docker socket mounted.

Related issues or tickets

No related issues found.

Reviews

• Technical review
• Editorial review
• Product review

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[docker-agent]

Assessment: 🟡 NEEDS ATTENTION

This PR adds two new Testcontainers getting-started guides (Go and Python) with good structure and content. However, there's an issue with the Go version prerequisite that needs correction.

[mdelapenya]

Regarding the bot's comments about Go 1.25+:

Go 1.25 is the correct minimum version. testcontainers-go v0.41.0 specifies go 1.25.0 in its go.mod (with toolchain go1.25.7). We verified compilation and tests pass with golang:1.25-alpine.

The bot's knowledge cutoff predates the Go 1.25 release.

[mdelapenya]

/review

[docker-agent]

Assessment: 🟢 APPROVE

This PR adds two comprehensive Testcontainers getting-started guides (Go and Python) migrated from testcontainers.com. The documentation is well-structured, follows Docker style guidelines, and includes all necessary supporting infrastructure.

Strengths:

• ✅ All front matter complete with required fields (title, description, keywords)
• ✅ No AI-isms, hedge words, or marketing language detected
• ✅ Code examples follow state-show-explain pattern
• ✅ Appropriate use of callouts (NOTE, TIP)
• ✅ Proper console code blocks with $ prompts
• ✅ Clear, factual explanations without passive voice
• ✅ Vale vocabulary updated for technical terms (pgx, psycopg, pytest)
• ✅ New testing-with-docker tag added correctly
• ✅ Manual page updated with guide links

No issues found - This is high-quality documentation ready to merge.

[dvdksn]

LGTM! 🧪 🚀

[aevesdocker]

Thank you @mdelapenya This looks awesome.
Feel free to start migrating the other guides now too!