CHANGES IN litedown VERSION 0.3

Added back/forward/refresh/print buttons to the toolbar in the litedown::roam() preview interface.
Set options(bitmapType = 'cairo') in fuse() if capabilities('cairo') is TRUE, which will generate smaller bitmap plot files (e.g., .png) than using quartz or Xlib, and is also a safer option for fuse() to be executed in parallel (rstudio/rmarkdown#2561).

CHANGES IN litedown VERSION 0.2

A data frame (or matrix/tibble) wrapped in I() is fully printed to a table now by default. Without I(), data objects are truncated to 10 rows by default when printing to tables.
When options(litedown.fig.alt = TRUE) and the chunk option fig.alt is unset, fuse() will emit reminders about the missing alt text for code chunks containing plots (thanks, @TimTaylor, #23). Providing alt text can improve the accessibility of images in HTML output. To avoid omitting the alt text inadvertently, you can set the option litedown.fig.alt in your .Rprofile.
Added the meta variable plain-title for HTML output, which is the plain version of the document title (i.e., without HTML tags), and used in the <title> tag.
Check boxes from - [ ] ... are no longer disabled in HTML output.
The implicit latest version of jsdelivr resources will be resolved to an explicit version, e.g., https://cdn.jsdelivr.net/npm/@xiee/utils/css/default.css will be resolved to https://cdn.jsdelivr.net/npm/@xiee/utils@X.Y.Z/css/default.css, where X.Y.Z is the current latest version. This will make sure the HTML output containing jsdelivr resources is stable.