Improve documentation

[jcmoraisjr]

HAProxy Ingress has now a docsy based site. Although the configuration keys and command-line options are properly documented, there are also some missing pieces out there:

• Fix typos and transcriptions -- there should be some typos and some badly transcritions in place, please help finding and fixing them;
• Move current examples and/or create new ones -- there are just few examples, and only two of them was moved to the new site;
• Implement TODOs -- if you're feeling creative, there are some todo's in some hard-to-write pages like getting-started and a few others.