feat: add testcontainers-oss quickstart guides

[mdelapenya]

• chore: add testcontainers entry in the OSS section of Manuals
• chore: adds quickstarts for tc-go and tc-java

Description

This PR adds the Testcontainers OSS section in the Manuals > OSS section of the docs.

It's adding the following pages:

• index page with a basic description of the project, with two cards:
  • why use testcontainers, linking to a benefits page
  • quicktart, linking to a folder with two pages: Go and Java

Below the cards grid, it links to the testcontainers.com/getting-started page.

The benefits page includes some of the content of the above getting-started page, and the Go and Java quickstart pages are copying the quickstart pages from Go (https://golang.testcontainers.org/quickstart/) and Java (https://java.testcontainers.org/quickstart/) in its 3 flavours (junit4, junit5 and spock)

Related issues or tickets

Reviews

• Technical review
• Editorial review
• Product review

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[aevesdocker]

Thanks @mdelapenya
As discussed in Slack, I've changed the content to point to the official TC site, instead of duplicating, whilst we figure out timelines for you and the TC team migrating all the content over.