Trim paragraph margins at the bottom of tab panels

[benjaoming]

This change affects all themes, however the behavior may also be visually problematic in several themes. I only just noticed it in sphinx-rtd-theme.

Themes that aren't affected probably also aren't affected by the margin change, since in this case they probably don't put margins under p elements.

As I understand sphinx-tabs-panel p:last-child, it will trigger if that particular <p> element is the last of all child elements in the tabs panel. So that should work as intended.

Before:

After:

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[benjaoming]

Just noticed #143 - the implementation there wouldn't work for panels with several paragraphs.

[codecov]

Codecov Report

Base: 97.27% // Head: 97.27% // No change to project coverage 👍

Coverage data is based on head (1feb1f8) compared to base (9431223).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #175   +/-   ##
=======================================
  Coverage   97.27%   97.27%           
=======================================
  Files           2        2           
  Lines         220      220           
=======================================
  Hits          214      214           
  Misses          6        6           

Flag	Coverage Δ
pytests	97.27% <ø> (ø)

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