Update pre-commit config to detect _pkgdown.y[a]ml

[insights-engineering-bot]

Update pre-commit config so that spellcheck pre-commit hooks detect both flavors of pkgdown config files

[github-actions]

Code Coverage Summary

Filename                           Stmts    Miss  Cover    Missing
-------------------------------  -------  ------  -------  ---------
R/g_boxplot.R                        108     108  0.00%    150-305
R/g_correlationplot.R                129     129  0.00%    253-415
R/g_density_distribution_plot.R       83      83  0.00%    125-233
R/g_lineplot.R                       252     252  0.00%    260-581
R/g_scatterplot.R                    118     118  0.00%    138-293
R/g_spaghettiplot.R                  100     100  0.00%    196-328
R/geom_axes_line.R                   167     167  0.00%    48-366
R/t_summarytable.R                    83      83  0.00%    87-205
R/utils.R                             68      68  0.00%    21-138
TOTAL                               1108    1108  0.00%

Results for commit: 763a8fc

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results