(DOCSP-44011) Removes mention of Debian 8. (#457)

<!-- Add a description of your PR here (optional) -->

- [DOCSP-44011](https://jira.mongodb.org/browse/DOCSP-44011)
-
[STAGING](https://deploy-preview-457--10gen-docs-ops-manager.netlify.app/tutorial/install-mongodb-agent-to-manage/)

### Self-Review Checklist

- [ ]
[Define](https://wiki.corp.mongodb.com/display/DE/Taxonomy+tagging+instructions)
taxonomy
[values](https://wiki.corp.mongodb.com/display/DE/Docs+Taxonomy) at top
of page.
- [ ] Add genre facets (tutorial or reference), as in this [example
PR](10gen/cloud-docs#5042).
- [ ] Add programmingLanguage (if necessary).
- [ ] Add meta keywords (if necessary).
- [ ] Resolve any new warnings or errors in the build.
- [ ] Proofread for spelling and grammatical errors.
- [ ] Check staging for rendering issues.
- [ ] Confirm links are working.

Author: erabil-mdb

snooty.toml

@@ -51,11 +51,11 @@ toc_landing_pages = [
 [constants]
 aagent = "Automation"
 admin-api = "Ops Manager Administration API"
-agent-dl-deb-debian-8-x64 = "Debian 8/9, Ubuntu 16.X/18.X - DEB"
-agent-dl-deb-debian-9-x64 = "Debian 8/9, Ubuntu 16.X/18.X - DEB"
-agent-dl-deb-ubuntu-16-x64 = "Debian 8/9, Ubuntu 16.X/18.X - DEB"
+agent-dl-deb-debian-8-x64 = "Debian 9, Ubuntu 16.X/18.X - DEB"
+agent-dl-deb-debian-9-x64 = "Debian 9, Ubuntu 16.X/18.X - DEB"
+agent-dl-deb-ubuntu-16-x64 = "Debian 9, Ubuntu 16.X/18.X - DEB"
 agent-dl-deb-ubuntu-16-zSeries = "Ubuntu 18.X Z-Series (s390x) - DEB"
-agent-dl-deb-ubuntu-18-x64 = "Debian 8/9, Ubuntu 16.X/18.X - DEB"
+agent-dl-deb-ubuntu-18-x64 = "Debian 9, Ubuntu 16.X/18.X - DEB"
 agent-dl-msi-windows = "Windows - MSI"
 agent-dl-rpm-rhel-6-x64 = "Amazon Linux - RPM"
 agent-dl-rpm-rhel-7-ppc = "RHEL/CentOS (7.X) Power (ppc64le) - RPM"

source/includes/choice-install-mongodb-agent-manage-platform.rst

@@ -20,7 +20,7 @@
 
             .. include:: /includes/agents/binaries-removed-from-path.rst
 
-            On x86_64 architecture running Debian 8/9/10/11/12 or Ubuntu 18.04/20.04/22.04:
+            On x86_64 architecture running Debian 9/10/11/12 or Ubuntu 18.04/20.04/22.04:
 
             .. include:: /includes/steps/install-mongodb-agent-manage-amd64.ubuntu1604-deb.rst
 

source/includes/choice-install-mongodb-agent-monitor-platform.rst

@@ -20,7 +20,7 @@
 
             .. include:: /includes/agents/binaries-removed-from-path.rst
 
-            On x86_64 architecture running Debian 8, Debian 9, Ubuntu 18.04,
+            On x86_64 architecture running Debian 9, Ubuntu 18.04,
             Ubuntu 20.04, or Ubuntu 22.04:
 
             .. include:: /includes/steps/install-mongodb-agent-monitor-amd64.ubuntu1604-deb.rst

source/includes/choice-update-mongodb-agent-backup-and-monitoring.rst

@@ -18,7 +18,7 @@
          .. tab:: Intel/AMD
             :tabid: x86
 
-            On x86_64 architecture running Debian 8, Debian 9, Ubuntu 18.04,
+            On x86_64 architecture running Debian 9, Ubuntu 18.04,
             Ubuntu 20.04, or Ubuntu 22.04:
 
             .. include:: /includes/steps/update-backup-to-mongodb-agent-amd64.ubuntu1604-deb.rst

source/includes/choice-update-mongodb-agent-monitoring.rst

@@ -18,7 +18,7 @@
          .. tab:: Intel/AMD
             :tabid: x86
 
-            On x86_64 architecture running Debian 8, Debian 9, Ubuntu 18.04,
+            On x86_64 architecture running Debian 9, Ubuntu 18.04,
             Ubuntu 20.04, or Ubuntu 22.04:
 
             .. include:: /includes/steps/update-monitoring-to-mongodb-agent-amd64.ubuntu1604-deb.rst

source/includes/list-tables/v5-agent-platform-support-table.rst

@@ -44,13 +44,6 @@
       - :icon:`check-circle`
       -
       -
-    * - 
-      - Debian 8
-      -
-      -
-      -
-      - :icon:`check-circle`
-      - :icon:`check-circle`
     * -
       - Debian 9
       - :icon:`check-circle`

source/includes/list-tables/v6-agent-platform-support-table.rst

@@ -58,14 +58,6 @@
       - :icon:`check-circle`
       -
       -
-    * - 
-      - Debian 8
-      - 
-      -
-      -
-      -
-      - :icon:`check-circle`
-      - :icon:`check-circle`
     * -
       - Debian 9
       -

source/includes/list-tables/v7-agent-platform-support-table.rst

@@ -58,13 +58,6 @@
       - :icon:`check-circle`
       - :icon:`check-circle`
 
-    * - 
-      - Debian 8
-      - 
-      - 
-      -
-      -
-
     * -
       - Debian 9
       -

source/includes/list-tables/v8-agent-platform-support-table.rst

@@ -82,16 +82,6 @@
       - :icon:`check-circle`
       -
       -
-    * - 
-      - Debian 8
-      - 
-      -
-      - 
-      -
-      -
-      -
-      - :icon:`check-circle`
-      - :icon:`check-circle`
     * -
       - Debian 9
       -