remove extensions from index

doc/index.rst

@@ -19,12 +19,12 @@ are relevant to the user of this library.
    :maxdepth: 1
    :caption: User Documentation
 
-   user/installation.rst
-   user/methods.rst
-   user/printers.rst
-   user/raspi.rst
-   user/usage.rst
-   user/barcode.rst
+   user/installation
+   user/methods
+   user/printers
+   user/raspi
+   user/usage
+   user/barcode
 
 Printer profiles
 ================
@@ -37,9 +37,9 @@ printer profiles. Details are described in
    :maxdepth: 1
    :caption: Printer profiles
 
-   printer_profiles/capabilities.rst
-   printer_profiles/available-profiles.rst
-   printer_profiles/available-encodings.rst
+   printer_profiles/capabilities
+   printer_profiles/available-profiles
+   printer_profiles/available-encodings
 
 Developer Documentation
 =======================
@@ -51,10 +51,10 @@ developers of this library.
    :maxdepth: 1
    :caption: Developer Documentation
 
-   dev/release-process.rst
-   dev/contributing.rst
-   dev/changelog.rst
-   dev/todo.rst
+   dev/release-process
+   dev/contributing
+   dev/changelog
+   dev/todo
 
 API Documentation
 =================
@@ -66,17 +66,17 @@ documentation of the API of this library.
    :maxdepth: 1
    :caption: API Documentation
 
-   api/escpos.rst
-   api/printer.rst
-   api/constants.rst
-   api/exceptions.rst
-   api/capabilities.rst
-   api/config.rst
-   api/image.rst
-   api/cli.rst
-   api/magicencode.rst
-   api/codepages.rst
-   api/katakana.rst
+   api/escpos
+   api/printer
+   api/constants
+   api/exceptions
+   api/capabilities
+   api/config
+   api/image
+   api/cli
+   api/magicencode
+   api/codepages
+   api/katakana
 
 ##################
 Indices and tables