feat(integrations): add support for datev (NangoHQ#2223)

## Describe your changes

- Added configuration for datev in providers.yaml
- Added datev to docs-v2.
- Added datev pages for Supported API groups in mint.json.
- Added datev SVG file in template-logos folder.
- Consolidate datev docs pages

## Issue ticket number and link

[EXT-76](https://linear.app/nango/issue/EXT-76/add-support-for-datev-api)
## Test
The documentation update was reviewed using `npm run docs` and verifying
on localhost.

Author: hassan254-prog

docs-v2/integrations/all/datev.mdx

@@ -0,0 +1,33 @@
+---
+title: Datev
+sidebarTitle: Datev
+---
+
+API configuration: [`datev`](https://nango.dev/providers.yaml)
+
+## Features
+
+| Features | Status |
+| - | - |
+| [Auth (OAuth)](/integrate/guides/authorize-an-api) | ✅ |
+| [Sync data](/integrate/guides/sync-data-from-an-api) | ✅ |
+| [Perform workflows](/integrate/guides/perform-workflows-with-an-api) | ✅ |
+| [Proxy requests](/integrate/guides/proxy-requests-to-an-api) | ✅ |
+| [Receive webhooks](/integrate/guides/receive-webhooks-from-an-api) | 🚫 (time to contribute: <48h) |
+
+<Tip>We can implement missing features in &lt;48h, just ask for it in the [community](https://nango.dev/slack).</Tip>
+
+## Getting started
+
+-   [OAuth related docs](https://developer.datev.de/datev/platform/en/node/133)
+-   [REST API docs](https://developer.datev.de/datev/platform/en/online-apis)
+-   [DATEV Postman collection](https://www.postman.com/adil-linuxbean/workspace/data/documentation/21088764-d2d642eb-6eea-4be6-8689-3d83c97d00ac?entity=request-21088764-842e0cb7-33bb-4263-8ec3-9244cbd547d3)
+
+<Tip>Need help getting started? Get help in the [community](https://nango.dev/slack).</Tip>
+
+## API gotchas
+
+-   An `access_token` is valid for 15 minutes, while the `refresh_token` is valid for 11 hours.
+-   At present, only DATEV partners or `DATEV Schnittstellenanbieter` have access to DATEV Online APIs. Therefore, a DATEV partner manager will handle the application registration.
+
+<Note>Add Getting Started links and Gotchas by [editing this page](https://github.com/nangohq/nango/tree/master/docs-v2/integrations/all/datev.mdx)</Note>

docs-v2/integrations/hr.mdx

@@ -10,6 +10,7 @@ sidebarTitle: HR
 
 <CardGroup cols={4}>
     <Card title="BambooHR" href="/integrations/all/bamboohr" color="#68a063" />
+    <Card title="Datev" href="/integrations/all/datev" color="#68a063" />
     <Card title="Deel" href="/integrations/all/deel" color="#68a063" />
     <Card title="Factorial" href="/integrations/all/factorial" color="#68a063" />
     <Card title="Gusto" href="/integrations/all/gusto" color="#68a063" />

docs-v2/integrations/legal.mdx

@@ -6,6 +6,7 @@
 <CardGroup cols={4}>
     <Card title="Anrok" href="/integrations/all/anrok" color="#68a063" />
     <Card title="BoldSign" href="/integrations/all/boldsign" color="#68a063" />
+    <Card title="Datev" href="/integrations/all/datev" color="#68a063" />
     <Card title="DocuSign" href="/integrations/all/docusign" color="#68a063" />
     <Card title="PandaDoc" href="/integrations/all/pandadoc" color="#68a063" />
     <Card title="Signnow" href="/integrations/all/signnow" color="#68a063" />

docs-v2/integrations/payroll.mdx

@@ -9,6 +9,7 @@ sidebarTitle: Payroll
 </Tip>
 
 <CardGroup cols={4}>
+    <Card title="Datev" href="/integrations/all/datev" color="#68a063" />
     <Card title="Deel" href="/integrations/all/deel" color="#68a063" />
     <Card title="Gusto" href="/integrations/all/gusto" color="#68a063" />
     <Card title="Payfil" href="/integrations/all/payfit" color="#68a063" />

docs-v2/mint.json

@@ -333,6 +333,7 @@
                 "integrations/all/coda",
                 "integrations/all/confluence",
                 "integrations/all/contentstack",
+                "integrations/all/datev",
                 "integrations/all/deel",
                 "integrations/all/dialpad",
                 "integrations/all/digitalocean",

packages/shared/providers.yaml

@@ -466,6 +466,30 @@ contentstack:
     authorization_url: https://${connectionConfig.subdomain}.contentstack.com/apps/${connectionConfig.appId}/authorize
     token_url: https://${connectionConfig.subdomain}.contentstack.com/apps-api/apps/token
     docs: https://docs.nango.dev/integrations/all/contentstack
+#Untested configuration. Please reach out if you have a test account that we can use to test it.
+datev:
+    categories:
+        - legal
+        - payroll
+        - hr
+    auth_mode: OAUTH2
+    authorization_url: https://login.datev.de/openid/authorize
+    token_url: https://api.datev.de/token
+    token_request_auth_method: basic
+    scope_seprator: ' '
+    default_scopes:
+        - openid
+    authorization_params:
+        response_type: code id_token
+        response_mode: query
+        nonce: AnotherRandomStringDatev
+    token_params:
+        grant_type: authorization_code
+    refresh_params:
+        grant_type: refresh_token
+    proxy:
+        base_url: https://api.datev.de
+    docs: https://docs.nango.dev/integrations/all/datev
 deel:
     categories:
         - hr