[BUG] Space after images

[tunix]

Describe the bug

When an image is placed inside the content, there seems to be no margin/padding added by default which causes the image be very close to the paragraph underneath.

• Device/Os: Ubuntu 20.10
• Type: Desktop
• Browser and version: Firefox 88.0
• Hugo Version: hugo v0.83.0-DEV-243951EB+extended linux/amd64 BuildDate=2021-04-22T17:07:16Z
• Theme Version: master (commit: fb0393f)

Steps to reproduce the behavior:

Place the following code piece before a paragraph:

{{< figure src="path/to/image.png" >}}

Expected behavior:

A default margin/padding should be applied to the image.

Screenshots

[kdkasad]

I checked and this wasn't introduced by my changes in #247, so it's up to @adityatelange whether he wants to change the style.