fix: fix DDR GRAND PRIX free play mode links

[nogic1008]

No description provided.

[commit-lint]

Bug Fixes

• change links to grand-prix-free (a218013)
• songs: add DDR GP free play series (291162f)

Contributors

nogic1008

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[codecov]

Codecov Report

Merging #769 (62d91d3) into master (98947ff) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #769      +/-   ##
==========================================
+ Coverage   91.36%   91.46%   +0.09%     
==========================================
  Files          19       19              
  Lines         440      445       +5     
  Branches       32       33       +1     
==========================================
+ Hits          402      407       +5     
  Misses         38       38              

Impacted Files	Coverage Δ
components/content/Level.vue	100.00% <100.00%> (ø)
components/content/SeriesList.vue	100.00% <100.00%> (ø)

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