fix(docs): Fix concepts.mdx referencing to installation page (#1779)

* Fix/update concepts.mdx referencing to installation page

The link for `/installation` is broken in the "Main Concepts" page.

The correct path would be `./installation` or  maybe `/installation/getting-started/installation`

* fix: docs

---------

Co-authored-by: Javier Martinez <[email protected]>

Author: mtulio

fern/docs/pages/installation/concepts.mdx

@@ -15,13 +15,13 @@ You get to decide the setup for these 3 main components:
 There is an extra component that can be enabled or disabled: the UI. It is a Gradio UI that allows to interact with the API in a more user-friendly way.
 
 ### Setups and Dependencies
-Your setup will be the combination of the different options available. You'll find recommended setups in the [installation](/installation) section.
+Your setup will be the combination of the different options available. You'll find recommended setups in the [installation](./installation) section.
 PrivateGPT uses poetry to manage its dependencies. You can install the dependencies for the different setups by running `poetry install --extras "<extra1> <extra2>..."`.
 Extras are the different options available for each component. For example, to install the dependencies for a a local setup with UI and qdrant as vector database, Ollama as LLM and HuggingFace as local embeddings, you would run
 
 `poetry install --extras "ui vector-stores-qdrant llms-ollama embeddings-huggingface"`.
 
-Refer to the [installation](/installation) section for more details.
+Refer to the [installation](./installation) section for more details.
 
 ### Setups and Configuration
 PrivateGPT uses yaml to define its configuration in files named `settings-<profile>.yaml`.
@@ -57,4 +57,4 @@ For local LLM there are two options:
 In order for LlamaCPP powered LLM to work (the second option), you need to download the LLM model to the `models` folder. You can do so by running the `setup` script:
 ```bash
 poetry run python scripts/setup
-```
+```