Clean-up styling rules

[lorenzwalthert]

This is a follow up to #705 to clean up location and names of styling rules.

[codecov-io]

Codecov Report

Merging #707 (535e8da) into master (713992f) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #707      +/-   ##
==========================================
- Coverage   90.47%   90.45%   -0.02%     
==========================================
  Files          47       47              
  Lines        2257     2253       -4     
==========================================
- Hits         2042     2038       -4     
  Misses        215      215              

Impacted Files	Coverage Δ
R/indent.R	100.00% <ø> (ø)
R/reindent.R	100.00% <ø> (ø)
R/rules-line-breaks.R	100.00% <ø> (ø)
R/rules-spaces.R	98.36% <ø> (ø)
R/rules-indention.R	100.00% <100.00%> (ø)
R/rules-tokens.R	100.00% <100.00%> (ø)
R/style-guides.R	100.00% <100.00%> (ø)

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