Default to SQLite rather than Postgres & Redis (#72)

* Initial rough draft switch to sqlite.

* Rewrote cache implemenation.

* Provide typed tasks.

* Task cleanup.

* Use same db for tasks.

* Provide task queue registration and service container injection.

* Added optional delay to tasks. Pool buffers when encoding.

* Added tests for the task client and runner.

* Added handler examples for caching and tasks.

* Cleanup and documentation.

* Use make in workflow.

* Updated documentation.

* Updated documentation.

pkg/form/submission.go

@@ -103,6 +103,8 @@ func (f *Submission) setErrorMessages(err error) {
 			message = "Enter a valid email address."
 		case "eqfield":
 			message = "Does not match."
+		case "gte":
+			message = fmt.Sprintf("Must be greater than or equal to %v.", ve.Param())
 		default:
 			message = "Invalid value."
 		}