docs: switch to goldmark markdown handler (#1304)

Abandon no longer supported blackfriday markdown handler and switch to
default goldmark markdown handler. Enabled typographer extension to
handle quotes and dashes.

Website is now building with hugo > 0.100 as well.

Build tested with hugo 0.101.0:
$ docker run --rm -it -v $(pwd):/src:Z -p 1313:1313 klakegg/hugo:0.101.0
server

Signed-off-by: Diego Rondini <diego.rondini@kynetics.com>

.gitignore

@@ -65,4 +65,5 @@ maven.properties
 docs/themes/**
 docs/public/**
 docs/content/rest-api/*.html
-.gitmodules
+.gitmodules
+docs/.hugo_build.lock