SELFDEV-415: [repo] deploy.yml, fix deploy cache undefined error (#20)

<!-- Ticket number or summary of work -->
# [SELFDEV-415]


## What changed?
<!-- Provide a bulleted list in the present tense -->
* Specify that the site should build using a fresh copy of the docs, not
a cached version

## Release notes draft
<!-- Provide an entry for the release notes using simple, conversational
language. Don't be too technical. Explain how the change will benefit
the merchant and link to the feature.

Examples:
* The newly-released [X feature] is now available to use. Now, you’ll be
able to [perform Y action].
* We're happy to announce [X feature], which can help you [perform Y
action].
* [X feature] helps you to create [Y response] using the [Z query
parameter]. Now, you can deliver [ex, localized shopping experiences for
your customers].
* Fixed a bug in the [X endpoint]. Now the [Y field] will appear when
you click [Z option]. -->
* 

## Anything else?
<!-- Add related PRs, salient notes, additional ticket numbers, etc. -->

ping {names}


[SELFDEV-415]:
https://bigcommercecloud.atlassian.net/browse/SELFDEV-415?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

.github/workflows/deploy.yml

@@ -5,12 +5,6 @@ on:
     branches:
       - main
   workflow_dispatch:
-    inputs:
-      buildWithCache:
-        description: 'Build with cache'
-        default: true
-        required: false
-        type: boolean
 
 jobs:
   build:
@@ -22,4 +16,4 @@ jobs:
 
     - name: Trigger Vercel Deploy Hook
       run: |
-        curl -X POST ${{ secrets.VERCEL_DEPLOY_HOOK_URL }}?buildCache=${{ inputs.buildWithCache }}
+        curl -X POST ${{ secrets.VERCEL_DEPLOY_HOOK_URL }}?buildCache=false