Modify the deployment spec for time-logger app in the tutorial docs

[kale-amruta]

Change Overview

The time-logger deployment spec in the tutorial documentation was not valid and was giving error as

The Deployment "time-logger" is invalid: 
* spec.selector: Required value
* spec.template.metadata.labels: Invalid value: map[string]string{"app":"time-logger"}: `selector` does not match template `labels`

The PR adds the required field in the spec

Pull request type

Please check the type of change your PR introduces:

• 🚧 Work in Progress
• 🌈 Refactoring (no functional changes, no api changes)
• 🐹 Trivial/Minor
• 🐛 Bugfix
• 🌻 Feature
• 🗺️ Documentation
• 🤖 Test

Issues

• fixes #issue-number

Test Plan

• 💪 Manual
• ⚡ Unit test
• 💚 E2E

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[viveksinghggits]

Let's add a note before heading Invoking Kanister Actions, that a better/real database example can be found by following https://github.com/kanisterio/kanister/tree/master/examples/.

[PrasadG193]

@kale-amruta could you please address the review once you get a chance?

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