examples improvement - certbot cloudflare and wildcard, clamav, crowdsec, ghost and gogs

examples/certbot-wildcard/README.md

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+# Certbot wildcard
+
+Simple example on how to get wildcard Let's Encrypt certificates through DNS challenge and use them with bunkerized-nginx.
+
+## Preamble
+
+We will assume that you already have some basic knowledges about Let's Encrypt DNS challenge. If that's not the case, you should read the [documentation](https://certbot.eff.org/docs/using.html#manual).
+
+## Architecture
+
+<img src="https://github.com/bunkerity/bunkerized-nginx/blob/dev/examples/certbot-wildcard/architecture.png?raw=true" />
+
+## Configuration
+
+First of all you will need to edit the **certbot-wildcard.sh** file with your domain(s).
+
+Then you can run the script to get the certificates. Don't forget that you will need to edit your DNS zone to prove that you own the domain(s).
+
+## Docker
+
+See [docker-compose.yml](https://github.com/bunkerity/bunkerized-nginx/blob/master/examples/certbot-wildcard/docker-compose.yml).