feat: configurable main page

[nitrosx]

Description

This PR adds the functionality to set in configuration which is the main page that users will be redirected to when typing the main URL of the instance.

Motivation

We have received multiple request to be able start the user journey from an arbitrary page different than the datasets list.

Changes:

Please provide a list of the changes implemented by this PR

• config file adding the entry defaultMainPage
• config app service adding enum with the options and chaniking them upon loading configuration

Tests included

• Included for each change/fix?
• Passing? (Merge will not be approved unless this is checked)

Documentation

• swagger documentation updated [required]
• official documentation updated [nice-to-have]

official documentation info

If you have updated the official documentation, please provide PR # and URL of the pages where the updates are included

Backend version

• Does it require a specific version of the backend
• which version of the backend is required: the changes are backward compatible. This PR is linked to the BE PR with the same name

Summary by Sourcery

Enable configuring the application’s landing page via a new defaultMainPage setting in the configuration, backed by an enum and routing guard to dynamically redirect users to the chosen page.

New Features:

• Introduce MainPageOptions enum and add defaultMainPage property to the app config interface
• Enhance AppConfigService to load, validate, and apply the configured main page with a fallback
• Add MainPageGuard and DummyComponent to routing to redirect the root path to the configured main page

Enhancements:

• Provide a default redirection to the datasets page if no or invalid defaultMainPage is specified
• Refactor services and components to use the new AppConfigInterface instead of the old AppConfig

[sourcery-ai]

Hey @nitrosx - I've reviewed your changes and they look great!

Prompt for AI Agents

Please address the comments from this code review:
## Individual Comments

### Comment 1
<location> `src/app/app-config.service.ts:145` </location>
<code_context>
     }
+
+    const config: AppConfigInterface = (this.appConfig as AppConfigInterface);
+    if ("defaultMainPage" in config && Object.keys(MainPageOptions).includes(config.defaultMainPage)) {
+      config.defaultMainPage = MainPageOptions[config.defaultMainPage];
+    } else {
+      config.defaultMainPage = MainPageOptions.DATASETS;
</code_context>

<issue_to_address>
Potential mismatch between enum keys and values in MainPageOptions check.

`defaultMainPage` may be a value (e.g., '/datasets') rather than a key, causing this check to fail and always use the fallback. Decide whether to check against enum keys or values and update the logic accordingly.
</issue_to_address>

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