Summary: Mailtrap adds Java SDK

Why It Matters: This change shows Mailtrap is making it easier for more developers to use their tools.

What Changed:

• Mailtrap changed the "View all" link for SDKs from https://api-docs.mailtrap.io/ to https://mailtrap.io/integrate-with/.
• Mailtrap changed the links for Python, PHP, Ruby, and NodeJS SDKs to a new format under https://mailtrap.io/integrate-with/.
• Mailtrap removed the Elixir SDK link.
• Mailtrap added a Java SDK link.