Add NestJS plugin

[jonnydgreen]

Also tweaks the docs by removing the version as it's unnecessary.

[codecov-commenter]

Codecov Report

Merging #22 (2f7c509) into main (5e7cb8a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #22   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        14    +1     
  Lines          647       739   +92     
  Branches        55        64    +9     
=========================================
+ Hits           647       739   +92     

Files	Coverage Δ
plugin_nestjs/plugin.ts	100.00% <100.00%> (ø)
plugin_postgresql/database.ts	100.00% <ø> (ø)
plugin_postgresql/migration_sql.ts	100.00% <100.00%> (ø)
plugin_postgresql/plugin.ts	100.00% <100.00%> (ø)
plugin_postgresql/server.ts	100.00% <ø> (ø)
plugin_postgresql/server_connection.ts	100.00% <ø> (ø)
plugin_postgresql/server_docker.ts	100.00% <ø> (ø)
setup_tests.ts	100.00% <ø> (ø)
type.ts	100.00% <ø> (ø)