PR: Update Spyder's logo

[isabela-pf]

Description of Changes

This PR updates the logos in img_src to reflect the voting in ux-improvements #50 and discussion in #13181. This changes how the logo appears in Spyder itself, Spyder's application icons, and in the readme.

I've marked it as draft because there are still some images I haven't replaced as I try to figure out why they are separate files when some of them look the same visually.

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)

• Included a screenshot or animation (if affecting the UI, see Licecap)

Issue(s) Resolved

Fixes #13181

Affirmation

By submitting this Pull Request or typing my (user)name below,
I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under Spyder's MIT (Expat) license.

I certify the above statement is true and correct:
isabela-pf

[isabela-pf]

/show binder

[github-actions]

👈 Launch a Binder instance on this branch

[isabela-pf]

Screenshots from binder after 69a0d1d

I'm definitely seeing less changes than I expected for changing eight files. On to the next experiment we go… 🧪

[isabela-pf]

eb13b89 and 79d3775 shows no changes! 😦 Fresh screenshots for proof:

I'm also finding that several of the images in img_src don't seem to be called anywhere. If someone can verify this, I'd be grateful. Images I think aren't called elsewhere in Spyder:
spyder-reset.svg
spyder-bdist_wininst.bmp
spyder-bdist_wininst.svg
spyder-big.svg
spyder-original.svg
spyder-small.svg
spyder-title_bbg.svg
spyder-title-horiz.svg
spyder-title.svg

[isabela-pf]

Changes in the main spyder/images directory! Here's how that's looking.

[isabela-pf]

Last commit just updated the SVG being used for the application icon. ✨ Huzzah!

[isabela-pf]

I think I've made all the changes based on team feedback, so let me know if it looks like anything is still incorrect or missing.

[ccordoba12]

Thanks @isabela-pf!

[flying-sheep]

HI @isabela-pf, the logo version in this PR still contain the line I pointed out in #13181 (comment). I interpreted your “:+1:” as agreement to change that detail, so I’m reminding you of it.