Remove repo package mentions apr3 (#1066)

Removes links to deleted repo-package docks. In line with
sourcegraph/sourcegraph#2955 and
#724

Author: Steaphan-Sadler

docs/admin/code_hosts/index.mdx

@@ -58,13 +58,6 @@ We recognize there are other code hosts including CVS, SVN, and many more. Today
 - [Non-Git code hosts](/admin/code_hosts/non-git)
   - [Perforce](/admin/repo/perforce)
   - [Plastic SCM](/admin/repo/plasticscm)
-  - [Package repository hosts](/admin/code_hosts/package-repos)
-    - [JVM dependencies](/admin/code_hosts/jvm)
-    - [Go dependencies](/admin/code_hosts/go)
-    - [npm dependencies](/admin/code_hosts/npm)
-    - [Python dependencies](/admin/code_hosts/python)
-    - [Ruby dependencies](/admin/code_hosts/ruby)
-    - [Rust dependencies](/admin/code_hosts/rust)
 
 ## Rate limits
 

docs/code-search/code-navigation/index.mdx

@@ -30,7 +30,6 @@ Code Navigation helps you with the following tasks:
 | [Popover](/code_navigation/explanations/features#popover)                                    | Quickly view a symbol's type signature and documentation without switching to another source file                                                                                              |
 | [Go to definition](/code_navigation/explanations/features#go-to-definition)                  | Click the button or symbol name, navigates you to the symbol's definition                                                                                                           |
 | [Find references](/code_navigation/explanations/features#find-references)                    | Selecting it in the popover lists all references, definitions, and implementations at the bottom, including precise and search-based results                                                   |
-| [Dependency navigation](/code_navigation/explanations/features#dependency-navigation) (Beta) | Extends code navigation to work across [packages](/admin/code_hosts/package-repos)  |
 | [Find implementations](/code_navigation/explanations/features#find-implementations)          | Click to go to a symbol's interface definition or, at the interface, see all implementations across repositories, including interfaces implemented by a struct                           |
 | [Perform an action](/code-search/code-navigation/features#perform-an-action)                        | When browsing code, you can perform a couple of actions like open in code host, raw download and view blame.                                                                         |
 

docs/integration/index.mdx

@@ -9,13 +9,6 @@ Sourcegraph integrates with your other tools to help you search, navigate, and r
   - [GitLab](/integration/gitlab)
   - [Bitbucket Cloud](/integration/bitbucket_cloud)
   - [Bitbucket Server / Bitbucket Data Center](/integration/bitbucket_server)
-  - [Package repository hosts](/admin/code_hosts/package-repos)
-    - [JVM dependencies](/integration/jvm)
-    - [npm dependencies](/integration/npm)
-    - [Python dependencies](/integration/python)
-    - [Go dependencies](/integration/go)
-    - [Ruby dependencies](/integration/ruby)
-    - [Rust dependencies](/integration/rust)
   - [Other Git repository hosts](/admin/code_hosts/other)
 - [Editor plugins](/integration/editor): jump to Sourcegraph from your editor
   - [Open in Editor](/integration/open_in_editor): jump to your editor from Sourcegraph