Migrate Nord repositories from `arcticicestudio` to `nordtheme`

[svengreb]

The latest “Northern Post — The state and roadmap of Nord“ announcement described the plans for the migration to Nord‘s new home home on GitHub and this epic (GitHub tasklist) is used to track to overall process.
For a better visualization, with a time-based structure and general overview see the “Roadmap ⧚“ view of Nord‘s “Planning & Roadmaps“ project board as well as the “Active ↻“ view for the current iteration.

The main goal is to migrate the repositories itself to this new nordtheme organization, including…

• …adjustments of any hyperlinks to previous arcticicestudio references as well as other, already migrated, repositories.
• …adjustments of any copyright information, removing Arctic Ice Studio as Nord brand due to its retirement.
• …adaption to updated documentation and style conventions which reduces the need to solve this through individual issues again afterwards.
• …adaption to Nord‘s new “Planning & Roadmaps“ project board by adding existing, already triaged or active, issues and preparing “fresh“ issues for the follow-up triaging later on.

Tasks

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1. nordtheme organization migration vim#335
   context-workflow scope-maintainability +2
2. nordtheme organization migration visual-studio-code#258
   context-workflow scope-maintainability +2
3. nordtheme organization migration iterm2#13
   context-workflow scope-maintainability +2
4. nordtheme organization migration tmux#79
   context-workflow scope-maintainability +2
5. nordtheme organization migration dircolors#32
   context-workflow scope-maintainability +2
6. nordtheme organization migration emacs#122
   context-workflow scope-maintainability +2
7. nordtheme organization migration gnome-terminal#38
   context-workflow scope-maintainability +2
8. nordtheme organization migration alacritty#33
   context-workflow scope-maintainability +2
9. nordtheme organization migration jetbrains#208
   context-workflow scope-maintainability +2
10. nordtheme organization migration xresources#15
    context-workflow scope-maintainability +2
11. nordtheme organization migration terminal-app#13
    context-workflow scope-maintainability +2
12. nordtheme organization migration xfce-terminal#14
    context-workflow scope-maintainability +2
13. nordtheme organization migration sublime-text#37
    context-workflow scope-maintainability +2
14. nordtheme organization migration slack#20
    context-workflow scope-maintainability +2
15. nordtheme organization migration hyper#38
    context-workflow scope-maintainability +2
16. nordtheme organization migration notepadplusplus#21
    context-workflow scope-maintainability +2
17. nordtheme organization migration tilix#19
    context-workflow scope-maintainability +2
18. nordtheme organization migration terminator#18
    context-workflow scope-maintainability +2
19. nordtheme organization migration termite#13
    context-workflow scope-maintainability +2
20. nordtheme organization migration atom-ui#91
    context-workflow scope-maintainability +2
21. nordtheme organization migration konsole#14
    context-workflow scope-maintainability +2
22. nordtheme organization migration web#241
    context-workflow scope-maintainability +2
23. nordtheme organization migration xcode#15
    context-workflow scope-maintainability +2
24. nordtheme organization migration atom-syntax#71
    context-workflow scope-maintainability +2
25. nordtheme organization migration putty#7
    context-workflow scope-maintainability +2
26. nordtheme organization migration gedit#20
    context-workflow scope-maintainability +2
27. nordtheme organization migration highlightjs#22
    context-workflow scope-maintainability +2
28. nordtheme organization migration mintty#7
    context-workflow scope-maintainability +2
29. nordtheme organization migration conemu#6
    context-workflow scope-maintainability +2
30. nordtheme organization migration guake#8
    context-workflow scope-maintainability +2
31. nordtheme organization migration eclipse-syntax#15
    context-workflow scope-maintainability +2
32. nordtheme organization migration brackets#9
    context-workflow scope-maintainability +2
33. nordtheme organization migration coda#8
    context-workflow scope-maintainability +2