Update IR filter removal

[nllho]

Resolves #2860.

Minor changes for readability and correctness:

• Make the top-level section "IR filters" and move the introduction there.
• Make "Filter Removal" a sub-section, and move the warnings there.
• Note that the sample procedure applies to both HQ & GS cameras but specifically depicts/references the HQ camera (to address Update the filter removal section for the GS camera #2860).
• Make the text match up to the images better!

[nathan-contino]

Some suggestions, but this is already a big step in the right direction. Hopefully you agree with my thoughts. If not, we'll hash it out. Thanks for improving this so far, almost there!

[nathan-contino]

lgtm mod a style guide issue and a reword suggestion for a piece of prose you didn't write (but that walks all over our style guide nonetheless).

Fix those and I'll merge this bad boi right in!

[lurch]

#2860 says "There is a back cover is present on GS Cam" and "GS Cam does not have washers" so the assembly / disassembly instructions here might need some additional caveats to better cover both cameras?
( @nathan-contino Can we get a HQ and GS camera shipped to @nllho so that she isn't just "typing blind"? )

[nllho]

#2860 says "There is a back cover is present on GS Cam" and "GS Cam does not have washers" so the assembly / disassembly instructions here might need some additional caveats to better cover both cameras? ( @nathan-contino Can we get a HQ and GS camera shipped to @nllho so that she isn't just "typing blind"? )

That would be awesome 😁 This update is only intended to remove ambiguity about the example procedure (i.e. it is HQ Cam that is shown in the demonstration, not GQ Cam).

[nathan-contino]

lgtm! nice job 🚀