Add bootstrap, more shortcodes and initial dark mode

layouts/shortcodes/col.html

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+<div class="col-{{ index .Params 0 }}">{{ .Inner }}</div>

layouts/shortcodes/container.html

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+<div class="container">{{ .Inner }}</div>

layouts/shortcodes/fontawesome.html

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+<span class="inline-svg" >
+    {{- $fname:=print "fontawesome/" ( .Get 0 ) ".svg" -}}
+    {{- $path:="<path" -}}
+    {{- $fill:="<path fill=\"currentColor\"" -}}
+    {{ replace (readFile $fname) $path $fill | safeHTML }}
+</span>

layouts/shortcodes/row.html

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+<div class="row">{{ .Inner }}</div>