The existing light theme has relatively low contrast between the text
(and other UI elements) and background (especially within code blocks).
This presents difficulties for people with reduced visual contrast
perception (common in older adults).
This patch makes changes to the default `light` theme to meet the
minimum contrast requirement of the v2.1 W3C WCAG (Web Content
Accessibility Guidelines)
https://www.w3.org/WAI/WCAG21/quickref/#contrast-minimum
The small size, and slender font used for the title text makes it hard
to read, even with the increased contrast colour scheme, so this patch
also increases the size of the title text font by 20%.
Closes#1442
Provides better feedback if user executes in a different folder than what is expected by mdbook
After the changes `mdbook build`
```
2020-12-19 14:27:35 [ERROR] (mdbook::utils): Error: Couldn't open SUMMARY.md in "/Users/vicky/rust/source_codes/mdbook_testing/src/src" directory
2020-12-19 14:27:35 [ERROR] (mdbook::utils): Caused By: No such file or directory (os error 2)
```
Previously: `mdbook build`
```
2020-12-19 14:28:46 [ERROR] (mdbook::utils): Error: Couldn't open SUMMARY.md
2020-12-19 14:28:46 [ERROR] (mdbook::utils): Caused By: No such file or directory (os error 2)
```
Currently, the `copy_files` function doesn't support symlink files due to
its use of `DirEntry::metadata` - To avoid this issue, this patch
resolves the file path first before checking for metadata.
Fixes#1157
It's unlikely that the bundled version wouldn't load, and it's
especially unlikely that the page would load but the bundled version
would not.
Also, if it doesn't load, it should fall back to another monospace font,
which is fine.
Before:
/path/to$ cat book/.nojekyll
This file makes sure that Github Pages doesn't process mdBook's output./path/to$ ▎
After:
/path/to$ cat book/.nojekyll
This file makes sure that Github Pages doesn't process mdBook's output.
/path/to$ ▎
