Add a topic guide for response function vocabulary

[wtbarnes]

This PR tackles the same problem as #99 but takes the approach of using a topic guide page rather than a glossary. My reasoning here was that the explanations needed for each entry felt too long for just a glossary page. We could still certainly have a glossary page that has short descriptions or links to this more expanded page.

This PR is the result of conversations with @namurphy, @joyvelasquez, @jslavin, and @kreevescfa. I would appreciate everyone having a read over this and making sure they agree!

To see the rendered version, click here.

[joyvelasquez]

Hi Will, thank you for compiling these note. The XRTpy team will review it and respond to you soon.

[wtbarnes]

One thought was that with the glossary, we would have been able to use :term:temperature response to link to the definition.

That's a good point. Would it make sense for a topic guide in this format to coexist with a glossary? Or would that be redundant?

[joyvelasquez]

Overall, this guide seems like a valuable resource for users of aiapy and xrtpy, offering a solid foundation in understanding instrument response functions. Thanks @wtbarnes !

[wtbarnes]

@jacobdparker @ayshih I'd be interested to have your perspectives on this as you two have thought more about the correct definitions of these terms.

[wtbarnes]

Feedback from @jacobdparker is that "transmittance" -> "transmissivity" and "reflectance"->"reflectivity"

[wtbarnes]

@byrdie you probably have thoughts on this as well

[byrdie]

Regarding reflectance vs reflectivity, I see both a lot but reflectivity seems to be more common in our community. I generally prefer reflectivity, but Google ngram shows that reflectance is more common

[wtbarnes]

Regarding reflectance vs reflectivity, I see both a lot but reflectivity seems to be more common in our community. I generally prefer reflectivity, but Google ngram shows that reflectance is more common

Given that, I'll stick with transmittance/reflectance for now. The AIA calibration paper also uses transmittance and reflectance.

[byrdie]

The nice thing about reflectance/transmittance too is that it lets you use absorbance instead of absorptivity which seems more natural and easier to say.

[namurphy]

Thank you so much for doing this! I'm really liking how it's turning out, and this page has the potential to be helpful to the solar physics community as a whole (and perhaps beyond).