Documentation is missing info for routing

[SpencerKaiser]

Description

Documentation isn't clear about Bolt's routing and what the base URL should be. The info below is addressed in the Getting Started guide, but only in a single, buried sentence.

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've searched for any related issues and avoided creating a duplicate issue.
  • This issue is related to, but not covers day Slash command endpoint #209

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Documentation Issue

As a first time Bolt developer, I wasn't sure what the base URL would be. I assumed (naively) that my Slash command /something should be directed to https://myapp.com/something, yet that is not the case. As mentioned in Getting Started, the app listens to /slack/events by default, yet that isn't mentioned anywhere in the README.

Suggested Solution

Update the README with a section for Routing that explains the base URL for the app is /slack/events but can be overridden using the endpoints parameter of the app constructor.

[SpencerKaiser]

If this is an addition y'all would like, I'll open a PR with the changes!

[shaydewael]

Updated this in the Getting Started guide and the README (#609), so I think we're safe to close this issue. Feel free to reopen if the changes are insufficient!