docs: auto-generate vimdoc

doc/cyberdream.txt

@@ -167,6 +167,7 @@ their default values:
 
         theme = {
             variant = "default", -- use "light" for the light variant. Also accepts "auto" to set dark or light colors based on the current value of `vim.o.background`
+            saturation = 1, -- accepts a value between 0 and 1. 0 will be fully desaturated (greyscale) and 1 will be the full color (default)
             highlights = {
                 -- Highlight groups to override, adding new groups is also possible
                 -- See `:h highlight-groups` for a list of highlight groups or run `:hi` to see all groups and their current values