Add supporting themes required for Lotusdocs

themes/hugo-mod-bootstrap-scss/exampleSite/layouts/partials/placeholder.html

@@ -0,0 +1,31 @@
+{{- $title := .title | default "Placeholder" -}}
+{{- $class := .class -}}
+{{- $default_color  := "#6c757d" -}}
+{{- $default_background := "#6c757d" -}}
+{{- $color := .color  | default $default_color -}}
+{{- $background := .background | default $default_background -}}
+{{- $width := .width | default "100%" -}}
+{{- $height := .height | default "180" -}}
+{{- $text := .text | default (printf "%sx%s" $width $height) -}}
+{{- $show_title := not (eq $title "false") -}}
+{{- $show_text := not (eq $text "false") -}}
+<svg
+  class="{{ with $class }}{{ . }}{{ end }}"
+  width="{{ $width }}"
+  height="{{ $height }}"
+  xmlns="http://www.w3.org/2000/svg"
+  {{ if (or $show_title $show_text) }}
+    role="img"
+    aria-label="{{ if $show_title }}
+      {{ $title }}{{ if $show_text }}:{{ end }}
+    {{ end }}{{ if ($show_text) }}{{ $text }}{{ end }}"
+  {{ else }}
+    aria-hidden="true"
+  {{ end }}
+  preserveAspectRatio="xMidYMid slice">
+  {{- if $show_title }}<title>{{ $title }}</title>{{ end -}}
+  <rect width="100%" height="100%" fill="{{ $background }}" />
+  {{- if $show_text }}
+    <text x="40%" y="50%" fill="{{ $color }}" dy=".3em">{{ $text }}</text>
+  {{ end -}}
+</svg>