rename package to starters

[maelle]

cf #103

All that remains to be renamed is an occurence in the tests/README.md (so will happen automatically) and the git submodule thing (but I'll do that in superbuild at the same time)

[maelle]

when this is merged

• [x] rename pRojects in superbuild
• [x] change build.sh in superbuild
• [x] rename GitHub repo
• [x] update repo URL
• [x] update the .RProj name
• [x] update the folder name
• [x] change remote URL

https://www.njtierney.com/post/2017/10/27/change-pkg-name/

Am I forgetting anything?

[codecov-io]

Codecov Report

Merging #105 into master will not change coverage. The diff coverage is 83.33%.

@@           Coverage Diff           @@
##           master     #105   +/-   ##
=======================================
  Coverage   67.56%   67.56%           
=======================================
  Files          12       12           
  Lines         555      555           
=======================================
  Hits          375      375           
  Misses        180      180

Impacted Files	Coverage Δ
R/project_health.R	0% <0%> (ø)	:arrow_up:
R/styler_precommit.R	100% <100%> (ø)	:arrow_up:
R/createTrainingProject.R	97.61% <100%> (ø)	:arrow_up:
R/use_readme.R	100% <100%> (ø)	:arrow_up:

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