feat: add optional hint/admonition icons (#383)

BREAKING CHANGE: The types of the `hint` short code have been renamed to `[note|tip|important|caution|warning]` the old types `[info|ok|warning|danger]` are still working, but should be considered as deprecated.

BREAKING CHANGE: The `hint` short code is using named arguments now. You have to change, e.g. `{{< hint warning >}}` to `{{< hint type=warning >}}`.

src/icons/check_circle_outline.svg

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+<!-- Generated by IcoMoon.io -->
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 28 28">
+<title>check_circle_outline</title>
+<path d="M14 25.239q4.601 0 7.92-3.319t3.319-7.92-3.319-7.92-7.92-3.319-7.92 3.319-3.319 7.92 3.319 7.92 7.92 3.319zM14 0q5.784 0 9.892 4.108t4.108 9.892-4.108 9.892-9.892 4.108-9.892-4.108-4.108-9.892 4.108-9.892 9.892-4.108zM20.441 7.822l1.972 1.972-11.239 11.239-6.967-7.033 1.972-1.972 4.995 4.995z"></path>
+</svg>

src/icons/dangerous.svg

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+<!-- Generated by IcoMoon.io -->
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 28 28">
+<title>dangerous</title>
+<path d="M21.802 19.833l-5.833-5.833 5.833-5.833-1.969-1.969-5.833 5.833-5.833-5.833-1.969 1.969 5.833 5.833-5.833 5.833 1.969 1.969 5.833-5.833 5.833 5.833zM19.833 0l8.167 8.167v11.666l-8.167 8.167h-11.666l-8.167-8.167v-11.666l8.167-8.167h11.666z"></path>
+</svg>

src/icons/error_outline.svg

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+<!-- Generated by IcoMoon.io -->
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 28 28">
+<title>error_outline</title>
+<path d="M14 25.239q4.601 0 7.92-3.319t3.319-7.92-3.319-7.92-7.92-3.319-7.92 3.319-3.319 7.92 3.319 7.92 7.92 3.319zM14 0q5.784 0 9.892 4.108t4.108 9.892-4.108 9.892-9.892 4.108-9.892-4.108-4.108-9.892 4.108-9.892 9.892-4.108zM12.62 6.967h2.761v8.413h-2.761v-8.413zM12.62 18.206h2.761v2.826h-2.761v-2.826z"></path>
+</svg>

src/icons/fire.svg

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+<!-- Generated by IcoMoon.io -->
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 28 28">
+<title>fire</title>
+<path d="M17.689 21.998q-0.32 0.32-0.8 0.576t-0.864 0.384q-1.152 0.384-2.272 0.032t-1.888-0.992q-0.128-0.128-0.096-0.256t0.16-0.192q1.216-0.384 1.92-1.216t0.96-1.792q0.192-0.896-0.064-1.728t-0.384-1.728q-0.128-0.704-0.096-1.376t0.288-1.312q0-0.128 0.128-0.128t0.192 0.064q0.384 0.832 0.992 1.472t1.28 1.216 1.216 1.248 0.672 1.568q0.064 0.384 0.064 0.704 0.064 0.96-0.32 1.92t-1.088 1.536zM21.529 11.054q-0.768-0.704-1.6-1.28t-1.6-1.344q-1.536-1.536-2.016-3.584t0.16-4.16q0.128-0.32-0.096-0.544t-0.544-0.096q-0.768 0.32-1.44 0.768t-1.312 0.896q-1.984 1.664-3.136 3.936t-1.312 4.864 0.8 5.088q0 0.128 0.032 0.256t0.032 0.256q0 0.576-0.512 0.832t-1.024-0.192q-0.128-0.192-0.192-0.32-1.024-1.28-1.376-2.912t-0.096-3.232q0.064-0.384-0.288-0.576t-0.608 0.128q-1.28 1.664-1.856 3.68t-0.448 4.064q0 0.576 0.096 1.184t0.288 1.184q0.448 1.536 1.216 2.816 1.216 2.048 3.264 3.424t4.416 1.696q2.496 0.32 5.024-0.256t4.448-2.304q1.408-1.344 2.208-3.104t0.864-3.68-0.704-3.712q-0.064-0.128-0.096-0.224t-0.096-0.224q-0.576-1.088-1.28-1.984-0.256-0.384-0.544-0.704t-0.672-0.64z"></path>
+</svg>

src/icons/info_outline.svg

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+<!-- Generated by IcoMoon.io -->
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 28 28">
+<title>info_outline</title>
+<path d="M12.62 9.793v-2.826h2.761v2.826h-2.761zM14 25.239q4.601 0 7.92-3.319t3.319-7.92-3.319-7.92-7.92-3.319-7.92 3.319-3.319 7.92 3.319 7.92 7.92 3.319zM14 0q5.784 0 9.892 4.108t4.108 9.892-4.108 9.892-9.892 4.108-9.892-4.108-4.108-9.892 4.108-9.892 9.892-4.108zM12.62 21.033v-8.413h2.761v8.413h-2.761z"></path>
+</svg>