Blog post: Line numbers

[Intelligent2013]

From metanorma/metanorma-iso#1004

To do:

• update metanorma.org documentation
• add blog post about line numbering feature

ISO XSLT supports the line numbering feature. To render line numbers, add the document attribute:

:presentation-metadata-linenumbers: true

PDF rendering example:

Source code with line numbers (linenumbers):

[source,ruby,linenumbers]
--
puts "Hello, world."
%w{a b c}.each do |x|
  puts x
end
--

PDF rendering example:

Note: currently, line numbers feature supported in ISO and IEEE draft documents.

[Intelligent2013]

Done in #836.