Add emoji to the demo poster to exercise Twemoji rendering

Includes a plain face, a flag (ASCII-range codepoints), a ZWJ family
sequence, and a skin-tone modifier, so the CI-built demo poster
doubles as a visual/functional check that the Twemoji font fix
(f25b229) actually renders these in color end to end.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Change-Id: Iff714337bde976d8eb42bc1de4e73153279792ec
diff --git a/inst/rmarkdown/templates/posterdown_ids/skeleton/skeleton.Rmd b/inst/rmarkdown/templates/posterdown_ids/skeleton/skeleton.Rmd
index e2d4983..8349dae 100644
--- a/inst/rmarkdown/templates/posterdown_ids/skeleton/skeleton.Rmd
+++ b/inst/rmarkdown/templates/posterdown_ids/skeleton/skeleton.Rmd
@@ -42,13 +42,13 @@
 
 # Introduction
 
-Welcome to `posterdown::ids_poster`! This is my attempt to adapt the `posterdown` R package to the IDS Mannheim corporate design. Most features from R Markdown are available in this package such as Markdown section notation, figure captioning, and even citations like this one [@R-rmarkdown]. The rest of this example poster will show how you can insert typical conference poster features into your own document. 
+Welcome to `posterdown::ids_poster`! πŸŽ‰ This is my attempt to adapt the `posterdown` R package to the IDS Mannheim corporate design. Most features from R Markdown are available in this package such as Markdown section notation, figure captioning, and even citations like this one [@R-rmarkdown]. The rest of this example poster will show how you can insert typical conference poster features into your own document, including emoji πŸ˜€ -- ASCII πŸ‡ΊπŸ‡Έ, ZWJ-sequence πŸ‘¨‍πŸ‘¨‍πŸ‘¦, and skin-tone-modifier ✊🏿 alike -- which is handy for CMC research posters.
 
 ## Objectives
 
-1. Easy to use reproducible poster design. [^1]
-2. Integration with R Markdown.
-3. Easy transition from `posterdown` ➝ `pagedown` report or manuscript documents [@R-pagedown] and [revealjs-ids](https://gitlab.ids-mannheim.de/ids/revealjs).
+1. βœ… Easy to use reproducible poster design. [^1]
+2. πŸ”— Integration with R Markdown.
+3. πŸ”„ Easy transition from `posterdown` ➝ `pagedown` report or manuscript documents [@R-pagedown] and [revealjs-ids](https://gitlab.ids-mannheim.de/ids/revealjs).
 
 [^1]:Footnotes are possible, too.
 
@@ -100,7 +100,7 @@
 
 # Conclusion
 
-Try `posterdown` out! Hopefully you like it!
+Try `posterdown` out! Hopefully you like it! πŸ˜ŠπŸ‘
 
 ```{r, include=FALSE}
 knitr::write_bib(c('knitr','rmarkdown','posterdown','pagedown'), 'packages.bib')