Add auth0 icon (#298)

* Add Git icon

* Remove transform

* Fix some issues

* Add auth0 icon

* Fix some issues

* Shrink styles

* Update README.md

images/reference/auth0.svg

@@ -0,0 +1 @@
+<svg width="152" height="168" viewBox="0 0 152 168" xmlns="http://www.w3.org/2000/svg"><title>Slice 1</title><path d="M120.127 135.861l-16.85-51.864 44.107-32.045H92.863L76.011.09l-.005-.014h54.53l16.855 51.871v-.001l.014-.008c9.79 30.092-.292 64.318-27.278 83.923zm-88.234 0l-.014.01 44.119 32.053 44.129-32.062-44.115-32.054-44.119 32.053zM4.624 51.939c-10.304 31.721 1.657 65.333 27.26 83.928l.004-.016L48.74 83.99 4.642 51.951H59.15L76.003.089l.004-.014H21.474L4.624 51.939z" fill="#EB5424" fill-rule="evenodd"/></svg>

images/svg/auth0.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+aria-label="auth0" role="img"
+viewBox="0 0 512 512"><rect
+width="512" height="512"
+rx="15%"
+fill="#fff"/><path d="M358.1,378.8 319.6,260 420.5,186.9H295.7l-38.6,-118.7-0.01,-0.03h124.8l38.6,118.7v-0.003l0.03,-0.02c22.4,68.8-0.7,147-62.4,192zm-201.9,0-0.036,0.03L257.13,452.2 358.09,378.84 257.17,305.51ZM93.85,186.85c-23.57,72.57 3.79,149.46 62.36,192l0.01,-0.036L194.77,260.17 93.89,186.87H218.6L257.15,68.2 257.2,68.2H132.4Z" fill="#eb5424"/></svg>