Add "lean" template

inst/rmarkdown/templates/lecturenotes-lean/skeleton/skeleton.Rmd

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+---
+title: Course title
+subtitle: Lecture title
+author:
+  name: Your name
+  affiliation: University | Course code
+# date: "`r format(Sys.time(), '%d %B %Y')`" ## Or "Lecture no."
+output: 
+  html_document:
+    keep_md: false
+    theme: journal
+    highlight: haddock
+    # code_folding: show
+    toc: yes
+    toc_depth: 4
+    toc_float: yes
+    css: css/preamble.css ## For multi-col environments
+  pdf_document:
+    latex_engine: xelatex
+    keep_tex: false ## Change to true if want keep intermediate .tex file
+    toc: true
+    toc_depth: 3
+    dev: cairo_pdf
+    # fig_width: 7 ## Optional: Set default PDF figure width
+    # fig_height: 6 ## Optional: Set default PDF figure height
+    extra_dependencies: ['booktabs', 'threeparttable', 'float'] # "longtable"
+    includes:
+      in_header: tex/preamble.tex ## For multi-col environments
+    pandoc_args:
+        --template=tex/mytemplate.tex ## For affiliation field. See: https://bit.ly/2T191uZ
+always_allow_html: true
+urlcolor: blue
+mainfont: cochineal
+sansfont: Fira Sans
+monofont: Fira Code ## Although, see: https://tex.stackexchange.com/q/294362
+## Automatically knit to both formats:
+knit: (function(inputFile, encoding) {
+ rmarkdown::render(inputFile, encoding = encoding, 
+ output_format = 'all') 
+ })
+---
+
+```{r setup, include=FALSE}
+knitr::opts_chunk$set(echo = TRUE, cache = TRUE, dpi=300)
+```
+

inst/rmarkdown/templates/lecturenotes-lean/template.yaml

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+name: Lecture Notes (lean)
+description: >
+   My Rmd lecture notes setup, designed for exporting to both HTML and PDF
+   formats. Takes care of things like consistent multi-column environments and
+   regression table output, support for non-standard fonts in figures, nice
+   affiliation typesetting for PDF format, etc.
+
+   Note: This "lean" version just includes the scaffolding without any example
+   code.
+create_dir: FALSE

inst/rmarkdown/templates/lecturenotes/skeleton/css/preamble.css

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+/*  See: https://bookdown.org/yihui/rmarkdown-cookbook/multi-column.html */
+.columns {display: flex; flex-basis: auto}