feat!: remove openapi v1 command (#1111)

## 🧰 Changes

Removes the `openapi` command in its current form. Will be replaced by
`openapi upload` (see #1116!)

Will be merging this PR into #1113
to collect all breaking changes as part of this PR!

## 🧬 QA & Testing

Provide as much information as you can on how to test what you've done.

## ⚠️ breaking changes

BREAKING CHANGE: `rdme openapi` has been removed. Please use `rdme
openapi upload` instead. Read more in [our migration
guide](https://github.com/readmeio/rdme/tree/v10/documentation/migration-guide.md).

.github/workflows/ci.yml

@@ -103,17 +103,6 @@ jobs:
         if: ${{ steps.openapi-validate-fail.outcome == 'success' }}
         run: echo "::error::Expected validation in previous step to fail" && exit 1
 
-      # Docs: https://rdme-test.readme.io
-      - name: Run `openapi` command
-        uses: ./rdme-repo/
-        with:
-          rdme: openapi oas-examples-repo/3.1/json/petstore.json --key=${{ secrets.RDME_TEST_PROJECT_API_KEY }} --id=${{ secrets.RDME_TEST_PROJECT_API_SETTING }}
-
-      - name: Run `openapi` command with weird arg syntax
-        uses: ./rdme-repo/
-        with:
-          rdme: openapi "oas-examples-repo/3.1/json/petstore.json" --key "${{ secrets.RDME_TEST_PROJECT_API_KEY }}" --id=${{ secrets.RDME_TEST_PROJECT_API_SETTING }}
-
       # this is a test to ensure that the rdme github action can run properly
       # the way that our users invoke it
       - name: E2E run of `openapi validate` on `next` branch