How to link files directly from Github (raw.github.com)

The great service RawGit was already mentioned, but I'll throw another into the ring: GitCDN.link

Benefits:

• Lets you link to specific commits, as well as auto-get the latest (aka master)
• Incurs no damage from high traffic volumes; RawGit asks that it's dev.rawgit.com links be only used during development, where as GitCDN give you access to the latest version, without the danger of the servers exploding
• Give you the option of auto minifying your HTML, CSS and JavaScript, or serving it as written (https://min.gitcdn.link).
• Adds compression (GZip)
• Adds all the correct headers (Content-Type, cache-control, e-tag, etc)

Full disclosure, I'm a project maintainer at GitCDN.link

You can use external server rawgithub.com. Just remove a dot between words 'raw' and 'github' https://raw.github.com/.. => https://rawgithub.com/ and use it. More info you find in this question.

However, according to the rawgithub website it will be shutting down at the end of October 2019.

You can link directly to raw files, but it's best not to do it since the raw files always get sent with a plain/text header and can cause loading problems.