[Tagging] remove “rendering” from proposal template

[Zeke Farwell]

I'm a very visual person so I find mockups of how a renderer might choose
to show a proposed feature helps me understand the proposal.   It
definitely shouldn't be mistaken to mean "how carto *should* render the
proposed feature" though.

Better section titles?

"Rendering ideas"
"Potential rendering"
"Rendering mockups"
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