Remove README of MapDB bundle (#5352)
Remove README of MapDB bundle (#5352)

This currently crashes our documentation deployment as it clashes with the official MapDB persistence service from openhab1-addons.
https://github.com/openhab/openhab2-addons/pull/5275 will merge the two into a single bundle and provide the official README with it.
theoweiss/openhab2,clinique/openhab2,theoweiss/openhab2,Snickermicker/openhab2,clinique/openhab2,Snickermicker/openhab2,clinique/openhab2,Snickermicker/openhab2,theoweiss/openhab2,theoweiss/openhab2,Snickermicker/openhab2,clinique/openhab2