feature(renderer): inline images deserve links, too

[pjanx]

They are used in libasciidoc's own README.adoc for badges and I wanted to use them in mine, without working around it with line noise:

perl -pe 's|\b(image:.*?\[.*?),\s*link=([^,]*?)(\])|+++<a href=$2>+++\n$1$3\n+++</a>+++|gx'

So that I'm not just bitching in issues. :) This was easy enough to add, even if tiring because of two super similar backends. Also notice that the templates are formatted differently.

[codecov]

Codecov Report

Merging #754 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #754   +/-   ##
=======================================
  Coverage   83.52%   83.52%           
=======================================
  Files          77       77           
  Lines        5602     5603    +1     
=======================================
+ Hits         4679     4680    +1     
  Misses        586      586           
  Partials      337      337           

[gdamore]

Looks pretty good to me... sorry for missing this in the original work.

[xcoulon]

thanks for addressing this issue, @pjanx 🙌