[ESS] flexdashboard

[Stephen Bond]

Hi,
I am trying to create dashboards and when run from emacs, the output
ignores the columns and everything in the title section.
for example this will produce the .Rmd

```
rmarkdown::draft("dashboard.Rmd", 
                 template = "flex_dashboard_bslib", 
                 package = "flexdashboard")
```
then M-n e, markdown, html and the output differs from what I get under
Rstudio. The difference is in the pandoc options.

from emacs it is:
/usr/bin/pandoc +RTS -K512m -RTS dashboard.knit.md --to html4 --from
markdown+autolink_bare_uris+tex_math_single_backslash --output
dashboard-exported.html --lua-filter /home/stephen/R/x86_64-pc-linux-
gnu-library/4.0/rmarkdown/rmarkdown/lua/pagebreak.lua --lua-filter
/home/stephen/R/x86_64-pc-linux-gnu-
library/4.0/rmarkdown/rmarkdown/lua/latex-div.lua --self-contained --
variable bs3=TRUE --section-divs --template /home/stephen/R/x86_64-pc-
linux-gnu-library/4.0/rmarkdown/rmd/h/default.html --no-highlight --
variable highlightjs=1 --variable theme=bootstrap --mathjax --variable
'mathjax-
url=https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'
--include-in-header /tmp/RtmpMoSyna/rmarkdown-str5f6a2502c30.html 

from rstudio:
/usr/lib/rstudio/bin/quarto/bin/tools/pandoc +RTS -K512m -RTS
dashboard.knit.md --to html4 --from
markdown+autolink_bare_uris+tex_math_single_backslash --output
dashboard.html --lua-filter /home/stephen/R/x86_64-pc-linux-gnu-
library/4.0/rmarkdown/rmarkdown/lua/pagebreak.lua --lua-filter
/home/stephen/R/x86_64-pc-linux-gnu-
library/4.0/rmarkdown/rmarkdown/lua/latex-div.lua --embed-resources --
standalone --variable bs3=FALSE --standalone --section-divs --template
/home/stephen/R/x86_64-pc-linux-gnu-
library/4.0/flexdashboard/www/flex_dashboard/default.html --variable
theme=bootstrap --mathjax --variable 'mathjax-
url=https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'
--include-in-header /tmp/Rtmp2v1O2j/rmarkdown-str5dd26b148526.html --
highlight-style pygments --include-in-header
/tmp/Rtmp2v1O2j/file5dd26ba75415html --include-before-body
/tmp/Rtmp2v1O2j/file5dd215c6a798.html --include-after-body
/tmp/Rtmp2v1O2j/file5dd272467781.html

running ediff reveals that I need --embed-resources, bs3=FALSE,
a different template etc.
is there a way to make .emacs handle this neatly and apply different
options when the title section declares flexdashboard? 
Thanks everybody
Stephen