Constrain width of detail view contents

[brianlove]

Limit the max width of the contents of the detail view to ensure the page doesn't get too wide on small viewports (like the iPhone 13's small, 390px viewport).

Closes #264

[github-actions[bot]]

No need for rebasing :+1: behind_count is 0 ahead_count is 1

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
572	370	65%	0%	🟢

New Files

No new covered files...

Modified Files

No covered modified files...

updated for commit: 0e8410f by action🐍

[github-actions[bot]]

JavaScript Coverage

Summary

Lines	Statements	Branches	Functions
	69.16% (397/574)	60.95% (192/315)	68.06% (130/191)

Modified Files • (68%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	69.16	60.95	68.06	68.84
components	65.81	63.3	62.3	65.35
DetailView.jsx	0	0	0	0	29–146