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Adds topic guide explaining autoalignment vs reprojection for GenericMap#8526

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Maya-Mohamed wants to merge 3 commits into
sunpy:mainfrom
Maya-Mohamed:add-autoalign-topic-guide
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Adds topic guide explaining autoalignment vs reprojection for GenericMap#8526
Maya-Mohamed wants to merge 3 commits into
sunpy:mainfrom
Maya-Mohamed:add-autoalign-topic-guide

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@Maya-Mohamed
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Adds a topic guide page explaining the difference between autoalignment
and reprojection for GenericMap.

Autoalignment (via autoalign parameter in GenericMap.plot()) is a
visualization-only feature that does not modify the underlying data array.
Reprojection (via GenericMap.reproject_to()) transforms the data onto a
new pixel grid and is appropriate for data analysis tasks like co-adding images.

This page was requested in #8284 and is based on slide 5 of the
coordinate-aware functionality presentation by @ayshih.

Fixes #8284

@Maya-Mohamed
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pre-commit.ci autofix

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Autoalignment is not reprojection explanation page

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