Fix broken links detected by make linkcheck-files

[melissawm]

References and relevant issues

Related to
#474

Description

Fixes a number of broken links detected by make linkcheck-files.

A few comments:

• it looks like this link does not exist anymore: further-resources/sample_data.md:17: [redirected permanently] [digitalpathologyassociation.org/whole-slide-imaging-repository](https://digitalpathologyassociation.org/whole-slide-imaging-repository) to [https://digitalpathologyassociation.org?preview_error](https://digitalpathologyassociation.org/?preview_error). I tried googling but only found this: http://www.wsirepository.org/ and it doesn't load. Any ideas?
• How can we replace the following link? developers/architecture/app_model.md:288: [broken] https://github.com/napari/napari/blob/main/napari/_app_model/_submenus.py: 404 Client Error: Not Found for url: https://github.com/napari/napari/blob/main/napari/_app_model/_submenus.py I couldn't find SubmenuItem in the codebase, maybe I'm missing something
• https://github.com/potating-potato has probably deleted their github account. I suggest we convert the links to static text if we want to preserve history.
• These hackmd docs seem to only be readable if you are logged in: https://hackmd.io/fmKp0If5RkiwWIxYYRdKpg and https://hackmd.io/@talley/SJB_lObBi#What-is-a-virtual-environment Should we make it readable by all, or ignore in the linkcheck?
• A few links will need to be fixed in npe2, I'll send a follow-up PR for that.
• This file does not seem to exist anymore, from a search at the btrack repo: tutorials/tracking/cell_tracking.md:229: [broken] https://github.com/quantumjot/btrack/blob/main/models/cell_config.json: 404 Client Error: Not Found for url: https://github.com/quantumjot/btrack/blob/main/models/cell_config.json. Should we replace with a new link?
• I will add a regex to ignore redirects from docs paths to stuff like "stable/" or "en/latest"

A few items are left, mostly links to old code. I will try to replace with permalinks where I can, but not sure if I'll be able to find all of them. If that's the case I might try to ping the original authors for an appropriate substitution.

[psobolewskiPhD]

Wow! Thanks for catching all those!
I caught one small issue and left a comment

[psobolewskiPhD]

Thanks!!
I wonder if we can squeeze this into 0.5.4 if we merge quickly?
cc: @jni

[melissawm]

Hi all - any other suggestions here?

[DragaDoncila]

LGTM! Let's get this in. Thanks for the ping @melissawm

[psobolewskiPhD]

Sorry I dropped the ball on this one 😭
Thanks for picking it up!