remove "organizations aren't supported" page on dotcom (#63932)

We want to support orgs on dotcom for grouping prompts in the Prompt
Library. Note that creating orgs was never actually disabled in the API,
so this was ineffectual anyway.


## Test plan

View the user settings area sidebar in dotcom mode and ensure the new
org button is shown.

Author: sqs

client/web/BUILD.bazel

@@ -1713,8 +1713,6 @@ ts_project(
         "src/user/settings/ScimAlert.tsx",
         "src/user/settings/UserSettingsArea.tsx",
         "src/user/settings/UserSettingsSidebar.tsx",
-        "src/user/settings/aboutOrganization/AboutOrganizationPage.tsx",
-        "src/user/settings/aboutOrganization/index.ts",
         "src/user/settings/accessTokens/UserSettingsCreateAccessTokenCallbackPage.tsx",
         "src/user/settings/accessTokens/UserSettingsCreateAccessTokenPage.tsx",
         "src/user/settings/accessTokens/UserSettingsTokensArea.tsx",
@@ -2473,7 +2471,6 @@ ts_project(
         "src/team/new/NewTeamPage.story.tsx",
         "src/tour/components/Tour/Tour.story.tsx",
         "src/user/profile/UserProfile.story.tsx",
-        "src/user/settings/aboutOrganization/AboutOrganizationPage.story.tsx",
     ],
     tags = [TAG_SEARCHSUITE],
     tsconfig = ":tsconfig",

client/web/src/user/settings/UserSettingsSidebar.tsx

@@ -1,9 +1,9 @@
-import { type FC, useState, useCallback } from 'react'
+import { type FC, useCallback, useState } from 'react'
 
 import { mdiMenu, mdiPlus } from '@mdi/js'
 import classNames from 'classnames'
 
-import { ProductStatusBadge, Button, Link, Icon, type ProductStatusType, Tooltip } from '@sourcegraph/wildcard'
+import { Button, Icon, Link, ProductStatusBadge, type ProductStatusType, Tooltip } from '@sourcegraph/wildcard'
 
 import type { AuthenticatedUser } from '../../auth'
 import type { BatchChangesProps } from '../../batches'
@@ -94,25 +94,20 @@ export const UserSettingsSidebar: FC<UserSettingsSidebarProps> = props => {
                                 </Tooltip>
                             </SidebarNavItem>
                         ))}
-                        {!siteAdminViewingOtherUser &&
-                            (window.context.sourcegraphDotComMode ? (
-                                <SidebarNavItem to="./about-organizations" onClick={collapseMobileSidebar}>
-                                    About organizations
-                                </SidebarNavItem>
-                            ) : (
-                                <div className={styles.newOrgBtnWrapper}>
-                                    <Button
-                                        to="/organizations/new"
-                                        variant="secondary"
-                                        outline={true}
-                                        size="sm"
-                                        as={Link}
-                                        onClick={collapseMobileSidebar}
-                                    >
-                                        <Icon aria-hidden={true} svgPath={mdiPlus} /> New organization
-                                    </Button>
-                                </div>
-                            ))}
+                        {!siteAdminViewingOtherUser && (
+                            <div className={styles.newOrgBtnWrapper}>
+                                <Button
+                                    to="/organizations/new"
+                                    variant="secondary"
+                                    outline={true}
+                                    size="sm"
+                                    as={Link}
+                                    onClick={collapseMobileSidebar}
+                                >
+                                    <Icon aria-hidden={true} svgPath={mdiPlus} /> New organization
+                                </Button>
+                            </div>
+                        )}
                     </SidebarGroup>
                 )}
                 <SidebarGroup>

client/web/src/user/settings/aboutOrganization/AboutOrganizationPage.module.scss

@@ -30,11 +30,6 @@ const UserSettingsSecurityPage = lazyComponent(
     'UserSettingsSecurityPage'
 )
 
-const AboutOrganizationPage = lazyComponent(
-    () => import('./aboutOrganization/AboutOrganizationPage'),
-    'AboutOrganizationPage'
-)
-
 const shouldRenderBatchChangesPage = ({
     batchChangesEnabled,
     user: { viewerCanAdminister },
@@ -79,12 +74,6 @@ export const userSettingsAreaRoutes: readonly UserSettingsAreaRoute[] = [
         render: lazyComponent(() => import('./research/ProductResearch'), 'ProductResearchPage'),
         condition: () => window.context.productResearchPageEnabled,
     },
-    {
-        path: 'about-organizations',
-        render: props => (
-            <AboutOrganizationPage {...props} telemetryRecorder={props.platformContext.telemetryRecorder} />
-        ),
-    },
     {
         path: 'permissions',
         render: lazyComponent(