Update virtual environment name in documentation from venv to .venv (#383)

* fix: add `.venv` to `.gitignore` file

* docs: change `venv` to `.venv`

* docs: separate powershell and command prompt instructions in `Getting Started > Installation"

* docs: update `Tutorials > Install your plugin` to use `.venv`, Command Prompt, and PowerShell

* fix(docs): fix unrecognized relative link info message

Author: Aevarkan

.gitignore

@@ -21,3 +21,7 @@ stubs/*
 dist/*
 endstone/_version.py
 conan_provider.cmake
+
+# Python virtual environment
+.venv/**
+.venv

docs/getting-started/installation.md

@@ -20,25 +20,31 @@ just delete and recreate the environment. It's trivial to set up:
 -   Create a new virtual environment with:
 
     ```
-    python3 -m venv venv
+    python3 -m venv .venv
     ```
 
 -   Activate the environment with:
 
-    === ":fontawesome-brands-windows: Windows"
+    === ":fontawesome-brands-windows: Command Prompt"
 
-        ``` sh
-        . venv/Scripts/activate
+        ``` cmd
+        . .venv\Scripts\activate.bat
+        ```
+
+    === ":fontawesome-brands-windows: PowerShell"
+
+        ``` powershell
+        . .venv\Scripts\Activate.ps1
         ```
 
     === ":fontawesome-brands-linux: Linux"
 
         ``` sh
-        . venv/bin/activate
+        . .venv/bin/activate
         ```
 
 
-    Your terminal should now print `(venv)` before the prompt, which is how you
+    Your terminal should now print `(.venv)` before the prompt, which is how you
     know that you are inside the virtual environment that you just created.
 
 -   Exit the environment with:

docs/tutorials/install-your-plugin.md

@@ -39,22 +39,28 @@ Before installing your first plugin, you will need to build it.
 
     To do so, you will need the activate the [virtual environment]. Please make sure Endstone is also installed inside the environment.
 
-    === ":fontawesome-brands-windows: Windows"
+    === ":fontawesome-brands-windows: Command Prompt"
 
-        ``` sh
-        . venv/Scripts/activate
+        ``` cmd
+        . .venv\Scripts\activate.bat
+        ```
+
+    === ":fontawesome-brands-windows: PowerShell"
+
+        ``` powershell
+        . .venv\Scripts\Activate.ps1
         ```
 
     === ":fontawesome-brands-linux: Linux"
 
         ``` sh
-        . venv/bin/activate
+        . .venv/bin/activate
         ```
 
     You can now enter this “development mode” by performing an [editable installation] inside the virtual environment, 
     using pip’s `-e/--editable` flag, as shown below:
 
-    ``` sh title="(venv)"
+    ``` sh title="(.venv)"
     pip install --editable .
     ```
 
@@ -86,4 +92,4 @@ Before installing your first plugin, you will need to build it.
 
 [editable installation]: https://pip.pypa.io/en/latest/topics/local-project-installs/
 
-[virtual environment]: ../../getting-started/installation/#environment
+[virtual environment]: ../getting-started/installation.md#environment