Simplify CI badge in README

[vlsi]

Overview

The table in UI looks cluttered.

[jlink]

How does javadoc.io collect the javadoc? IMO only Javadoc for api packages should be published. Is there a way to influence that? If not I tend to leave the link to javadoc.io out.

[vlsi]

It fetches javadocs from Central.

I've updated the badge link to http://javadoc.io/badge/net.jqwik/jqwik-api.svg, so now it properly links to jqwik-api javadocs. See preview at https://github.com/vlsi/jqwik/tree/patch-1

[jlink]

With the current javadoc link we're missing the optional modules web and time. Why not link to https://jqwik.net/docs/1.7.2/javadoc/index.html or https://jqwik.net/docs/current/javadoc/index.html?

[vlsi]

I've updated the link

[jlink]

@vlsi Thanks!