Add inTextImg shortcode

Allows adding in-line-text images

usage in page.md =>
This image is inlined {{< inTextImg.html url="image.png" >}} here.

optional args:
- height
- alt

layouts/shortcodes/inTextImg.html

@@ -0,0 +1,5 @@
+{{- $Img := (.Get "url") }}
+{{- $height := (.Get "height") }}
+{{- $alt := (.Get "alt") }}
+
+<img class="in-text" height="{{ $height | default `15px` }}" src="{{$Img}}" alt="{{$alt}}">