Create head_custom.html

Author: francescobianco

docs/_includes/head_custom.html

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+<meta property="og:title" content="Mush - Scripting for DevOps" />
+<meta property="og:description" content="Mush is the shell package builder. Mush downloads your shell package’s dependencies, compiles your packages, makes distributable packages, and uploads them to GitHub, as public community’s package registry" />
+<meta property="og:type" content="website" />
+<meta property="og:url" content="https://mush.javanile.org/" />
+<meta property="og:image" content="https://mush.javanile.org/assets/img/memes/meme-03.jpg" />