FEATURE: Create Admin Developer Page

[pconrad]

Add a "Developer Info" option to the Admin menu that leads to a page with information for Developers.

Model it after the page in HappyCows:

• https://github.com/ucsb-cs156/proj-happycows/blob/main/frontend/src/main/pages/DeveloperPage.jsx

Add the following information to the page as well:

<p>Note: to ensure that the links to the currently deployed commit work properly, be sure to set the 
<code>SOURCE_REPO</code> property on your dokku deployment.  For example: </p>
<pre>
dokku config:set my-deployment SOURCE_REPO=https://github.com/ucsb-cs156-s26/proj-happycows-s26-17
</pre>

This should render as:

Note: to ensure that the links to the currently deployed commit work properly, be sure to set the SOURCE_REPO property on your dokku deployment. For example:

dokku config:set my-deployment SOURCE_REPO=https://github.com/ucsb-cs156-s26/proj-happycows-s26-17

In addition, modify the properties in application.properties so that the Swagger link does not show up on the main menu in production (we will be able to access swagger via the developer page instead.)