Move embed for Odysee into a shortcode.

layouts/shortcodes/odysee.html

@@ -1 +1,8 @@
-TBD/TODO
+{{   $src := .Get 0 | default (.Get "url") | default (.Get "src")
+}}{{ $width := .Get 1 | default (.Get "width") | default "65" }}
+<iframe
+   id="odysee-iframe"
+   style="width:{{ $width }}%; aspect-ratio:16 / 9;"
+   src="{{ $src }}"
+   allowfullscreen>
+</iframe>