Re-use output parameters of R Markdown headers as part of CMD_Render

[nuest]

We should re-use the existing output parameters for the html_document output type, see

containerit/R/Class-Cmd.R

Line 163 in 51d7b26

CMD_Render <-

If an R Markdown document configures the output as follows, the toc configuration is lost in the documented rendered by the container:

output:
  html_document:
    df_print: paged
    toc: yes