legacy docs: update integration landing page (#24524)

## Summary & Motivation

This is a long overdue PR that:

- Removes confusing contents from integration docs (legacy docs) and
redirects to the most relevant page:
  | integration | old docs | changes |
  | --- | --- | --- |
| great expectations | /integrations/great-expectations | removed and
redirected to
https://dagster.io/blog/ensuring-data-quality-with-dagster-and-great-expectations
|
| airbyte | /guides/dagster/airbyte-ingestion-as-code | removed and
redirected to /integrations/airbyte |
| databricks | /integrations/databricks | removed and redirected to
Pipes /concepts/dagster-pipes/databricks |

- Removes libraries that are not considered as integrations. Mainly two
cohorts:
- OSS deployment related (most won't apply to Dagster+ users; and direct
deployments to their own doc sections):
    - Celery
    - Celery & Docker
    - Dask
    - Docker
    - MySQL
    - PostgreSQL
  - quality too low
    - Papaertrial
    - MLflow
- Adds good integrations to the integration landing page:
  - AWS ECS
  - AWS Lambda
  - AWS Glue
  - Kubernetes
  - Shell / Bash
- Adds more community-supported integrations to the integration landing
page:
  - Census (moved from core)
  - Cube
  - Delta Lake
  - SDF
  - Open Metadata
NOTE: we have meltano and hex but they are both op-based integrations,
so i tend to not include them until we or have the partner update them.


## How I Tested These Changes

https://09-16-legacy-docs-update-integration-landing-page.dagster.dagster-docs.io/integrations

## Changelog

`NOCHANGELOG`

docs/content/_navigation.json

@@ -889,10 +889,6 @@
           {
             "title": "Airbyte Cloud & Dagster",
             "path": "/integrations/airbyte-cloud"
-          },
-          {
-            "title": "Ingestion as code",
-            "path": "/guides/dagster/airbyte-ingestion-as-code"
           }
         ]
       },
@@ -902,7 +898,7 @@
       },
       {
         "title": "Databricks",
-        "path": "/integrations/databricks"
+        "path": "/concepts/dagster-pipes/databricks"
       },
       {
         "title": "dbt",
@@ -1004,10 +1000,6 @@
         "title": "Fivetran",
         "path": "/integrations/fivetran"
       },
-      {
-        "title": "Great Expectations",
-        "path": "/integrations/great-expectations"
-      },
       {
         "title": "Google BigQuery",
         "path": "/integrations/bigquery",