Add HelpScout integration (#495)

* Add initial helpscout integration

* Finish integration, add changeset

* Add new integration to package lock

.changeset/hot-ads-decide.md

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+---
+'@gitbook/integration-helpscout': major
+---
+
+This change releases the first version of the HelpScout integration for GitBook

integrations/helpscout/.eslintrc.json

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+{
+    "extends": ["@gitbook/eslint-config/integration"]
+}

integrations/helpscout/gitbook-manifest.yaml

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+name: helpscout
+title: HelpScout
+organization: gitbook
+visibility: public
+description: Add the HelpScout chat widget to your published GitBook content
+summary: |
+    # Overview
+
+    The HelpScout integration for GitBook allows you to display the HelpScout chat widget on your public documentation to connect and interact with your readers.
+
+    # How it works
+
+    Automatic chat widget on your documentation: Each of your connected GitBook spaces will fetch the HelpScout chat widget script and add it to your published content.
+
+    # Configure
+
+    You can configure the integration on single or multiple public spaces by navigating to the integrations in sub-navigation or org settings. You will then have to provide HelpScout ID to finish the configuration.
+categories:
+    - analytics
+script: src/index.tsx
+icon: ./assets/icon.png
+previewImages:
+    - assets/helpscout-preview.png
+# The following scope(s) are available only to GitBook Staff
+# See https://developer.gitbook.com/integrations/configurations#scopes
+scopes:
+    - space:script:inject
+    - site:script:inject
+secrets: {}
+contentSecurityPolicy:
+    script-src: https://beacon-v2.helpscout.net;
+configurations:
+    space:
+        properties:
+            helpscout_id:
+                type: string
+                title: HelpScout ID
+                description: Your HelpScout integration ID.
+        required:
+            - helpscout_id
+    site:
+        properties:
+            helpscout_id:
+                type: string
+                title: HelpScout ID
+                description: Your HelpScout integration ID.
+        required:
+            - helpscout_id