Fix NA values in solarized themes

R/solarized_dark.R

   text_slide_number_color = "#586e75",
   code_highlight_color = "#268bd240",
   code_inline_color = "#6c71c4",
-  code_inline_background_color = "NA",
+  code_inline_background_color = NA,
   inverse_background_color = "#fdf6e3",
   inverse_text_color = "#002b36",
   inverse_text_shadow = FALSE,
   inverse_header_color = inverse_text_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = "NA",
+  title_slide_background_image = NA,
   left_column_subtle_color = "#586e75",
   left_column_selected_color = "#93a1a1",
   blockquote_left_color = "#cb4b16",

R/solarized_light.R

   text_slide_number_color = "#93a1a1",
   code_highlight_color = "#268bd240",
   code_inline_color = "#6c71c4",
-  code_inline_background_color = "NA",
+  code_inline_background_color = NA,
   inverse_background_color = "#002b36",
   inverse_text_color = "#fdf6e3",
   inverse_text_shadow = FALSE,
   inverse_header_color = inverse_text_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = "NA",
+  title_slide_background_image = NA,
   left_column_subtle_color = "#93a1a1",
   left_column_selected_color = "#586e75",
   blockquote_left_color = "#cb4b16",

R/theme_settings.R

   text_slide_number_color         = solarized$base1,
   code_highlight_color            = "#268bd240", #xaringanthemer:::apply_alpha(solarized$blue, 0.25)
   code_inline_color               = solarized$violet,
-  code_inline_background_color    = "NA",
   inverse_background_color        = solarized$base03,
   inverse_text_color              = solarized$base3,
-  inverse_text_shadow             = "{FALSE}",
   inverse_header_color            = "{inverse_text_color}",
   title_slide_text_color          = "{inverse_text_color}",
   title_slide_background_color    = "{inverse_background_color}",
-  title_slide_background_image    = "NA",
   left_column_subtle_color        = solarized$base1,
   left_column_selected_color      = solarized$base01,
   blockquote_left_color           = solarized$orange,
   text_slide_number_color         = solarized$base01,
   code_highlight_color            = "#268bd240", #xaringanthemer:::apply_alpha(solarized$blue, 0.25)
   code_inline_color               = solarized$violet,
-  code_inline_background_color    = "NA",
   inverse_background_color        = solarized$base3,
   inverse_text_color              = solarized$base03,
-  inverse_text_shadow             = "{FALSE}",
   inverse_header_color            = "{inverse_text_color}",
   title_slide_text_color          = "{inverse_text_color}",
   title_slide_background_color    = "{inverse_background_color}",
-  title_slide_background_image    = "NA",
   left_column_subtle_color        = solarized$base01,
   left_column_selected_color      = solarized$base1,
   blockquote_left_color           = solarized$orange,

man/solarized_dark.Rd

   background_color = "#002b36", link_color = "#b58900",
   text_bold_color = "#d33682", text_slide_number_color = "#586e75",
   code_highlight_color = "#268bd240", code_inline_color = "#6c71c4",
-  code_inline_background_color = "NA", inverse_background_color = "#fdf6e3",
+  code_inline_background_color = NA, inverse_background_color = "#fdf6e3",
   inverse_text_color = "#002b36", inverse_text_shadow = FALSE,
   inverse_header_color = inverse_text_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = "NA", left_column_subtle_color = "#586e75",
+  title_slide_background_image = NA, left_column_subtle_color = "#586e75",
   left_column_selected_color = "#93a1a1", blockquote_left_color = "#cb4b16",
   table_border_color = "#657b83", table_row_border_color = "#657b83",
   table_row_even_background_color = "#073642", text_size = "20px",

man/solarized_light.Rd

   background_color = "#fdf6e3", link_color = "#b58900",
   text_bold_color = "#d33682", text_slide_number_color = "#93a1a1",
   code_highlight_color = "#268bd240", code_inline_color = "#6c71c4",
-  code_inline_background_color = "NA", inverse_background_color = "#002b36",
+  code_inline_background_color = NA, inverse_background_color = "#002b36",
   inverse_text_color = "#fdf6e3", inverse_text_shadow = FALSE,
   inverse_header_color = inverse_text_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = "NA", left_column_subtle_color = "#93a1a1",
+  title_slide_background_image = NA, left_column_subtle_color = "#93a1a1",
   left_column_selected_color = "#586e75", blockquote_left_color = "#cb4b16",
   table_border_color = "#839496", table_row_border_color = "#839496",
   table_row_even_background_color = "#eee8d5", text_size = "20px",