Delete website/docs/dbt-cli directory (#4494)

Closes #2073 

## What are you changing in this pull request and why?

Running through the follow-up tasks and removing old pages. 

## Checklist
<!--
Uncomment if you're publishing docs for a prerelease version of dbt
(delete if not applicable):
- [ ] Add versioning components, as described in [Versioning
Docs](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-entire-pages)
- [ ] Add a note to the prerelease version [Migration
Guide](https://github.com/dbt-labs/docs.getdbt.com/tree/current/website/docs/docs/dbt-versions/core-upgrade)
-->
- [ ] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
and [About
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
so my content adheres to these guidelines.
- [ ] Add a checklist item for anything that needs to happen before this
PR is merged, such as "needs technical review" or "change base branch."

Adding new pages (delete if not applicable):
- [ ] Add page to `website/sidebars.js`
- [ ] Provide a unique filename for the new page

Removing or renaming existing pages (delete if not applicable):
- [ ] Remove page from `website/sidebars.js`
- [ ] Add an entry `website/static/_redirects`
- [ ] [Ran link
testing](https://github.com/dbt-labs/docs.getdbt.com#running-the-cypress-tests-locally)
to update the links that point to the deleted page

---------

Co-authored-by: Ly Nguyen <[email protected]>

website/vercel.json

@@ -2,6 +2,16 @@
   "cleanUrls": true,
   "trailingSlash": false,
   "redirects": [
+    {
+      "source": "/docs/about/overview",
+      "destination": "/docs/introduction",
+      "permanent": true
+    },
+    {
+      "source": "/dbt-cli/cli-overview",
+      "destination": "/docs/core/about-dbt-core",
+      "permanent": true
+    },  
     {
     "source": "/guides/advanced/creating-new-materializations",
     "destination": "/guides/create-new-materializations",
@@ -1604,7 +1614,7 @@
     },
     {
       "source": "/docs/dbt-cloud/cloud-overview",
-      "destination": "/docs/get-started/getting-started/set-up-dbt-cloud",
+      "destination": "/docs/cloud/about-cloud/dbt-cloud-features",
       "permanent": true
     },
     {
@@ -2639,7 +2649,7 @@
     },
     {
       "source": "/docs/cloud-overview",
-      "destination": "/docs/dbt-cloud/cloud-overview",
+      "destination": "/docs/cloud/about-cloud/dbt-cloud-features",
       "permanent": true
     },
     {