Adding devices, projects, and courses

[tmorshed]

Motivation behind the PR:

Came upon many of the sections that could be updated with up-to-date links, details, and even new sections that could be added on summer schools.

The library has been useful to many members of the NTX community & highlighting some more of them in the repo seems beneficial to all parties, both to help orient new community members, and to recognize the previous members' contributions.

Thinking of a pathway where we can get some more updates to this repository, add a license, and pin it to web pages and slack workspaces in the NTX community. Many discussions like this happen on various communication channels, and this could be a good introductory resource for many.

Summary of changes:

• Added a section on top with a citation to the NTX community.
• Added some details and more items to the BCI Experiment Design and analysis section.
• Added NTX Services in consulting
• Added a lot of devices and updated links to older ones in:
  • EEG devices
  • EEG parts
  • Multimodal
  • NIRS
  • Blogs
  • Summer Schools
• In "upcoming tech":
  • Some formatting
  • Added OPM
• Tutorials
  • EEG101 is now deprecated but still works for some users. EEGEdu has taken its place as the replacement in the community.
  • EEG Noteboosk isn't a set of tutorials anymore. It's expanded to an API for experiement design, EEG recording + analysis. Under the new name EEG-ExPy. Lastly:
• Regenerated the TOC
• Fixed a lot of typos here and there.

[tmorshed]

Thank you so much @obrunodelgado and @alexfigtree! :v: The conflicts are now resolved and should be good to merge now.