Update README removing colon signs section headers (#265)

Update README to remove the colon sign from all section headers to make formatting consistant with other projects from the Open Home Foundation.

README.md

@@ -12,7 +12,7 @@ Because it runs on a full Linux system and offers access significantly more loca
 
 [![A project from the Open Home Foundation](https://www.openhomefoundation.org/badges/ohf-project.png)](https://www.openhomefoundation.org/)
 
-## Features:
+## Features
 
 - Works with [Home Assistant](https://www.home-assistant.io/integrations/esphome/) using the [ESPHome](https://esphome.io/) protocol/API (via [aioesphomeapi](https://github.com/esphome/aioesphomeapi))
 - Feature local on-device wake word detection using integrated [OpenWakeWord](https://github.com/dscripka/openWakeWord) or [MicroWakeWord](https://github.com/kahrendt/microWakeWord)
@@ -24,10 +24,9 @@ Because it runs on a full Linux system and offers access significantly more loca
 - Prebuild docker image available on [GitHub Container Registry](https://github.com/OHF-Voice/linux-voice-assistant/pkgs/container/linux-voice-assistant)
 - Prebuild Raspberry Pi image
 
+## Usage
 
-## Usage:
+### Hardware
-
-### Hardware:
 
 A more extensive list for possible compatible hardware can be found in the [PiCompose documentation](https://github.com/florian-asche/PiCompose) but basically any microphone that works with [PipeWire (multimedia framework for Linux)](https://pipewire.org/) can in theory be used for voice input with the prebuild image from there, you should however preferably use a far-field microphone-array solution if want better result. 
 
@@ -39,15 +38,15 @@ As for the minimum required compute performance on these satellites the target r
 
 But you can also install LVA on AMD64 devices, for example on your Linux desktop computer.
 
-### Software:
+### Software
 
-#### Installation:
+#### Installation
 
 For Raspberry Pi users, we provide a prebuild image that can be flashed to a SD card. See [PiCompose](https://github.com/florian-asche/PiCompose).
 
 For all other users we have different installation methods available (Docker, systemd), each with its own dedicated instructions. See [Linux-Voice-Assistant - Installation](docs/install.md). 
 
-#### Parameter overview:
+#### Parameter overview
 
 💡 **Note:** There is a [environment variable](docs/install_application.md#environment-variables-reference) for each parameter if you use docker or systemd based setup.
 
@@ -80,7 +79,7 @@ usage: __main__.py [-h] [--name NAME] [--audio-input-device AUDIO_INPUT_DEVICE]
 | `--enable-thinking-sound` | Enable thinking sound on startup | False |
 | `--debug` | Print DEBUG messages to console | False |
 
-## Build Information:
+## Build Information
 
 Image builds can be tracked in this repository's `Actions` tab, and utilize [artifact attestation](https://docs.github.com/en/actions/security-guides/using-artifact-attestations-to-establish-provenance-for-builds) to certify provenance.
 
@@ -92,9 +91,9 @@ The Docker images are built using GitHub Actions, which provides:
 
 The documentation for the build process can be found in the [GitHub Actions Workflows](.github/workflow.md) file.
 
-## Development:
+## Development
 
-### Code Quality Checks:
+### Code Quality Checks
 
 The project uses the following tools to ensure code quality:
 - **Black**: Code formatting (88 characters per line, PEP 8 compliant)
@@ -103,7 +102,7 @@ The project uses the following tools to ensure code quality:
 - **pylint**: Code quality checks
 - **mypy**: Static type analysis
 
-### Setup:
+### Setup
 
 To use the development tools (linting, testing, etc.), you need to install the required dependencies:
 
@@ -112,14 +111,14 @@ To use the development tools (linting, testing, etc.), you need to install the r
 source .venv/bin/activate
 ```
 
-### Linting Commands:
+### Linting Commands
 
-#### Run all linting checks:
+#### Run all linting checks
 ``` sh
 ./script/lint...
 ```
 
-#### Individual linting commands (with auto-fix support):
+#### Individual linting commands (with auto-fix support)
 
 | Script | Description | Auto-fix Available? |
 |--------|-------------|---------------------|
@@ -129,7 +128,7 @@ source .venv/bin/activate
 | `./script/lint_mypy` | Runs static type analysis with mypy | No |
 | `./script/lint_pylint` | Runs code quality checks with pylint | Yes, use `--auto` flag |
 
-#### Examples:
+#### Examples
 
 Run a specific lint check:
 ``` sh
@@ -142,7 +141,7 @@ Auto-fix formatting issues (Black + isort):
 ./script/lint_isort --auto
 ```
 
-### Testing:
+### Testing
 
 Run the test suite:
 ``` sh