Update macOS dev docs

[mrmir]

What are you trying to accomplish?

We're updating the dev docs to better reflect the current state of the OP installation on macOS.

The postgres install command has been changed a little and it now creates a DB instance by default. Also, a database connection flag needs to be added to prevent crashes, and steps to install java and imagemagick have been added.

[as-op]

Unfortunately, we cannot update the headline, too. This would break links.

Hi @EinLama, please feel free to change headlines as you see fit. :)

There is a Github action checking the links inside the markdown docs, so those anchor links can be easily adjusted.
If something is linked from the website to a changed docs anchor, there is another link checker detecting that.

You can also run the link check script locally with
$ script/docs/check_links

(Just renaming folder names would lead to different urls, that has to be handled with care and a note to me, so that I maybe can add redirects to the website.)

[mrmir]

Unfortunately, we cannot update the headline, too. This would break links.

Hi @EinLama, please feel free to change headlines as you see fit. :)

There is a Github action checking the links inside the markdown docs, so those anchor links can be easily adjusted. If something is linked from the website to a changed docs anchor, there is another link checker detecting that.

You can also run the link check script locally with $ script/docs/check_links

(Just renaming folder names would lead to different urls, that has to be handled with care and a note to me, so that I maybe can add redirects to the website.)

@EinLama This is okay to merge but I'm leaving it open as I don't know if you want to do something about the headlines.

[EinLama]

Thank you, @mrmir and @as-op. Took the chance to adjust the headline 😉

[EinLama]

I've added another commit with more info as discussed.

@as-op I followed the documentation style guide in order to insert a [!TIP] and hope I did it correctly.

[aaron-contreras]

Thanks for this!