Provide 'User Guide' page on /docs (#132)

diff --git a/docs/01_try-overview.md b/docs/01_try-overview.md
index 29a059d..c8b2bd3 100644
--- a/docs/01_try-overview.md
+++ b/docs/01_try-overview.md
@@ -2,6 +2,7 @@
 id: user-guide-introduction
 title: Apache StreamPipes Documentation
 sidebar_label: Overview
+slug: /
 ---
 
 This is the documentation of Apache StreamPipes.
diff --git a/docs/user-guide-first-steps.md b/docs/user-guide-first-steps.md
index b7ca89f..28874f9 100644
--- a/docs/user-guide-first-steps.md
+++ b/docs/user-guide-first-steps.md
@@ -205,5 +205,5 @@
 
 We hope we gave you an easy quick start into StreamPipes.
 If you have any questions or suggestions, just send us an email.
-From here on you can explore all features in the [User Guide](user-guide-introduction) or go to the [Developer Guide](extend-setup) to learn how to write your own StreamPipes processing elements.
+From here on you can explore all features in the [User Guide](./) or go to the [Developer Guide](extend-setup) to learn how to write your own StreamPipes processing elements.
 
diff --git a/website-v2/blog/2019-09-05-release-0630.md b/website-v2/blog/2019-09-05-release-0630.md
index c321542..040080d 100644
--- a/website-v2/blog/2019-09-05-release-0630.md
+++ b/website-v2/blog/2019-09-05-release-0630.md
@@ -56,7 +56,7 @@
 
 
 ## Documentation
-We updated and restructured the user guide, which now consists of four parts: [Introduction](/docs/user-guide-introduction), [Tour](/docs/user-guide-tour), [Installation](/docs/user-guide-installation) and [First Steps](/docs/user-guide-first-steps).
+We updated and restructured the user guide, which now consists of four parts: [Introduction](/docs/), [Tour](/docs/user-guide-tour), [Installation](/docs/user-guide-installation) and [First Steps](/docs/user-guide-first-steps).
 We also updated all screenshots to reflect the current look and feel of StreamPipes.
 
 In addition, the developer guide was further extended (e.g., there is now a new tutorial on creating data sinks). Maven archetypes are now the recommended way to create new pipeline elements.
diff --git a/website-v2/blog/2022-09-05-using-factory.io-with-streampipes.md b/website-v2/blog/2022-09-05-using-factory.io-with-streampipes.md
index 50d19e4..d7685ed 100644
--- a/website-v2/blog/2022-09-05-using-factory.io-with-streampipes.md
+++ b/website-v2/blog/2022-09-05-using-factory.io-with-streampipes.md
@@ -28,7 +28,7 @@
 
 The next step is to connect the PLC to StreamPipes. To achieve this we need to create an adapter.
 
-- Start <a href="https://streampipes.apache.org/docs/docs/user-guide-introduction.html">*StreamPipes*</a>, go to the *
+- Start <a href="https://streampipes.apache.org/docs/docs/">*StreamPipes*</a>, go to the *
   *CONNECT** menu and create a **NEW ADAPTER**.
 - Select the **PLC4X S7** adapter, insert the **IP-address** of your PLC and **import the file** with the PLC tags (see
   below). Then click **NEXT** on the bottom right.
diff --git a/website-v2/src/components/Teaser.tsx b/website-v2/src/components/Teaser.tsx
index fe1f457..cdbac89 100644
--- a/website-v2/src/components/Teaser.tsx
+++ b/website-v2/src/components/Teaser.tsx
@@ -25,7 +25,7 @@
             <div className={"teaser-actions text-center"}>
               <a href="/download/" className="sp-button sp-button-large sp-button-blue sp-button-margin"><i
                 className="fas fa-download"></i> Download</a>
-              <a href="/docs/user-guide-introduction/"
+              <a href="/docs"
                  className="sp-button sp-button-large sp-button-gray sp-button-margin"><i
                 className="fas fa-book"></i> Documentation
               </a>
diff --git a/website-v2/src/components/home/Support.tsx b/website-v2/src/components/home/Support.tsx
index 375b0f2..a86d5b5 100644
--- a/website-v2/src/components/home/Support.tsx
+++ b/website-v2/src/components/home/Support.tsx
@@ -9,7 +9,7 @@
       <section className="d-sm-flex clearfix align-items-center justify-content-center">
         <SupportLink imageSrc={"/img/open_source/icon-github.png"} href={"https://www.github.com/apache/streampipes"}
                      label={"Github"}></SupportLink>
-        <SupportLink imageSrc={"/img/open_source/icon-docs.png"} href={"/docs/user-guide-introduction/"}
+        <SupportLink imageSrc={"/img/open_source/icon-docs.png"} href={"/docs/"}
                      label={"Documentation"}></SupportLink>
         <SupportLink imageSrc={"/img/open_source/icon-docker.png"} href={"https://hub.docker.com/u/apachestreampipes"}
                      label={"Docker Hub"}></SupportLink>
diff --git a/website-v2/src/navbar/navbar.js b/website-v2/src/navbar/navbar.js
index 987b373..c58215a 100644
--- a/website-v2/src/navbar/navbar.js
+++ b/website-v2/src/navbar/navbar.js
@@ -9,7 +9,7 @@
     "position": "right",
     items: [
       {
-        "to": "docs/user-guide-introduction",
+        "to": "docs/",
         "label": "Apache StreamPipes - User Guide",
       },
       {
diff --git a/website-v2/src/pages/download.tsx b/website-v2/src/pages/download.tsx
index ab67117..0f6e787 100644
--- a/website-v2/src/pages/download.tsx
+++ b/website-v2/src/pages/download.tsx
@@ -49,7 +49,7 @@
                                                     </span>
               </div>
               <div className="col-md-11 col-9">
-                Check the <a href="/docs/user-guide-introduction/"> user
+                Check the <a href="/docs/"> user
                 guide</a> and learn how to make your first steps with StreamPipes!
               </div>
             </div>