docs: enable syntax highlighting in several docs files

... for better readability

Closes #6286

curl.se: new home

Closes #6172

src: Consistently spell whitespace without whitespace

Whitespace is spelled without a space between white and space, so
make sure to consistently spell it that way across the codebase.

src: Consistently spell whitespace without whitespace

Whitespace is spelled without a space between white and space, so
make sure to consistently spell it that way across the codebase.

Closes #6023
Reviewed-by: Daniel Stenberg <daniel@haxx.se>
Reviewed-by: Emil Engler <me@emilengler.com>

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MANUAL: update examples to resolve without redirects

www.netscape.com is redirecting to a cookie consent form on Aol, and
cool.haxx.se isn't responding to FTP anymore. Replace with examp

MANUAL: update examples to resolve without redirects

www.netscape.com is redirecting to a cookie consent form on Aol, and
cool.haxx.se isn't responding to FTP anymore. Replace with examples
that resolves in case users try out the commands when reading the
manual.

Closes #6024
Reviewed-by: Daniel Stenberg <daniel@haxx.se>
Reviewed-by: Emil Engler <me@emilengler.com>

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MANUAL: update a dict-using command line

The 'web1913' database is now invalid, use 'gcide' instead.

docs: fix some typos

Closes #4680

docs/MANUAL.md: converted to markdown from plain text

... will make it render as a nicer web page.

Closes #4131