Revert "Add manifest to slack [MAPS-70] (#10212)" (#10218)

This reverts commit 3b72a13.

Author: JuliRossi

apps/slack/README.md

@@ -99,8 +99,6 @@ This sections explains how to run the Slack app locally.
 
 ### Lambda
 
-- Change Dockerfile node version to 18. It should look like: `FROM node:18-alpine AS base`
-- Change serverless.yml runtime node version to 18. It should look like  `runtime: nodejs18.x`
 - Copy `lambda/config/serverless.dev.yml.example` to `lambda/config/serverless.dev.yml`
 - Create a new Contentful app, if this has not been done already.
   - Set frontend URL to `http://localhost:1234`

apps/slack/frontend/.env.development.example

@@ -1,9 +1,2 @@
 REACT_APP_SLACK_CLIENT_ID=<your-slack-app-client-id>
-REACT_APP_BACKEND_BASE_URL=https://slack-backend-dev.ngrok.io/dev/api
-
-## This are only needed to run the updateAppAction script
-CONTENTFUL_ACCESS_TOKEN=<your-contentful-access-token>
-CONTENTFUL_ORG_ID=<your-contentful-organization-id>
-CONTENTFUL_APP_DEF_ID=<your-contentful-app-definition-id>
-#Optional
-APP_ACTION_ID=<your-app-action-id> 
+REACT_APP_BACKEND_BASE_URL=https://slack-backend-dev.ngrok.io/dev/api