Added index and API docs. Fixed accent color

docs/api/configuration.md

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+# API configuration
+
+The API server stores all config keys in JSON format in the file `config.json` located under the project's root.
+On this page you can find all config sections and keys that can be set.
+
+## database
+
+Configuration section where all database-related keys are stored.
+
+### name
+
+MongoDB database name.  
+
+> Defaults to: `"garbage_api"`
+
+### host
+
+MongoDB database host.  
+
+> Defaults to: `"127.0.0.1"`
+
+### port
+
+MongoDB database port.  
+
+> Defaults to: `27017`
+
+### user
+
+MongoDB database user. Can be string or `null`.  
+
+> Defaults to: `null`
+
+### password
+
+MongoDB database password. Can be string or `null`.  
+
+> Defaults to: `null`

docs/api/installation.md

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+# Installation
+
+## Requirements
+
+* [Git](https://git-scm.com)
+* [MongoDB](https://www.mongodb.com)
+* [Python 3.8+](https://www.python.org)
+
+## Installation process
+
+This manual assumes that your default Python interpreter is called `python` and is Python 3 of the compatible version.
+
+??? question "What Python interpreter do I use?"
+
+    Python may have multiple instances installed on your machine.
+    On some Linux machines Python 2.7 is the default interpreter called `python`
+    and Python 3 is called `python3` or `python39`.  
+
+    You can check which Python version you use using following methods:
+
+    === "Linux"
+
+        Check which interpreter is used:
+
+        ``` sh title="Shell"
+        which python
+        ```
+
+        and check the Python version:
+
+        ``` sh title="Shell"
+        python -V
+        ```
+
+        You can also change default python as follows:
+
+        ``` sh title="Shell"
+        sudo update-alternatives --config python
+        ```
+
+    === "Windows"
+
+        Check which interpreters are available:
+
+        ``` sh title="Terminal"
+        where python
+        ```
+
+        and check the Python version used by default:
+
+        ``` sh title="Terminal"
+        python -V
+        ```
+
+        You can also change default python using [this guide](https://stackoverflow.com/a/68139696).
+
+    Next, use the interpreter of choice instead of `python` during the installation:
+
+    ``` shell title="Shell"
+    /usr/local/bin/python311 -m venv .venv
+    ```
+
+    Please note that after the activation of a virtual environment, interpreter you need
+    already has a correct alias and is called `python` regardless of the version.
+
+### Install Mongo
+
+Please follow the [official installation manual](https://www.mongodb.com/docs/manual/installation) for that.
+
+### Clone the source code
+
+``` sh
+# Clone the repository
+git clone https://git.end-play.xyz/GarbageReminder/API.git
+# Then go the repository's directory
+cd API
+```
+
+### Create virtual environment
+
+=== "Linux"
+
+    Create virtual environment and activate it:
+    
+    ``` powershell title="Shell"
+    python -m pip install virtualenv
+    virtualenv .venv
+    .venv/bin/activate
+    ```
+
+=== "Windows"
+
+    Create virtual environment and activate it:
+    
+    ``` powershell title="Terminal"
+    python -m pip install virtualenv
+    virtualenv .venv
+    .venv\Scripts\Activate.ps1
+    ```
+
+### Install the requirements  
+
+``` sh
+python -m pip install -r requirements.txt
+```
+
+### Configure the API server
+
+This is a minimal configuration needed for the first start. For more config keys visit the [configuration](api/configuration.md) section in the documentation.
+
+1. Copy file example to the config file
+
+    ``` sh
+    cp config_example.json config.json
+    ```
+
+2. Open `config.json` with your favorite text editor
+3. Change keys in the `"database"` section to match your MongoDB setup
+
+### Start the API server
+
+You can run your API by the following command:  
+`uvicorn main:app --host 127.0.0.1 --port 3000`  
+
+Learn more about available uvicorn arguments using `uvicorn --help`