Revert "add rst-tables plugin bundle as a submodule"

This reverts commit d9704ef7d90072b292fd75f87273aea69d7e4ebb.

Conflicts:
	.gitmodules
Revert "add bufexplorer via new pathogen install method"

This reverts commit 216c0c0cc121154ffd7d0dcd47826593e5a638c8.

Conflicts:
	.gitmodules
Revert "add simple-sdb-integration plugin for scala"

This reverts commit 551cfe4a86e3c850c0bdd996979fdd09ccf06a87.