Add article about 'Setting Up SSH Authentication for GitHub'

[szuryuu]

Why:
This article addresses a common issue discussed in the community, specifically how to save GitHub login credentials on Linux. The discussion can be found here: Stack Overflow thread. By providing a clear guide on setting up SSH authentication, this content aims to simplify workflows for users.

What's being changed:
Added a new article: "Setting Up SSH Authentication for GitHub" in the content directory.

Included code examples and instructions for generating SSH keys, configuring them in GitHub, and managing repositories using SSH.

Check off the following:
[ ] A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR.

[ ] The changes meet the documentation fundamentals.

[ ] All CI checks are passing, and the content looks great in the review environment.

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on the review server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
authentication/connecting-to-github-with-ssh/index.md	fpt ghec ghes@ 3.163.153.143.133.12	fpt ghec ghes@ 3.163.153.143.133.12
New file: authentication/connecting-to-github-with-ssh/setting-up-ssh-authentication-for-github.md	fpt ghec ghes@ 3.163.153.143.133.12	fpt ghec ghes@ 3.163.153.143.133.12

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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