Node template love (#6560)

* Node template love

Better description in node/Cargo.toml
Example dispatchables should have non-zero weights
Changes to README to bring in line with current DevHub Node Template

* Update README.md

cleaned up, reworked text, ready for round 2

* Add DbWeight

* Update README.md

* Consistent Playground buttons

* "setup" -> "set up"

Co-authored-by: joe petrowski <[email protected]>

* Import `Get` trait to fix build

Co-authored-by: Addie Wagenknecht <[email protected]>
Co-authored-by: Ricardo Rius <[email protected]>
Co-authored-by: joe petrowski <[email protected]>