(fix): @types/jest should be a dep, not a devDep

[agilgur5]

• per bug report, this caused an issue where the @types/jest that was installed via create would have a version mismatch with the jest and jest-related deps used by TSDX

• and ts-jest's installation instructions also say to install @types/jest, so it's kind of a peerDep to it

• also move @types/shelljs to devDeps as it's not needed for usage of the CLI, it's only used internally

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Fixes #633 . @types/jest was added to the templates in one of the first commits in 9010ecbda5121. Per the issue, @types/jest was added as a devDep in #146 when the first TS test was added (makes sense) and @types/shelljs was added as a dep in #244

[agilgur5]

ts-jest recently added @types/jest as a dep: https://github.com/kulshekhar/ts-jest/issues/1859