docs(connectors): add section about adding built-in connectors

[jayjayjpg]

Description

Following our discussion on Slack, this is adding additional documentation around built-in connectors and how to add them to custom binaries.

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• I have followed the Code Guidelines.
• There is no other pull request for the same update/change.
• I have written unit tests.
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[maha-hajja]

Thank you for taking the initiative with these super helpful instructions! lovely work

[lovromazgon]

Thanks for your addition @jayjayjpg! The issue is that this document is supposed to be reworked altogether and moved to conduit.io (#1015). How important is it to get this in now?

Also, I'm thinking if it would make sense to have a separate page on conduit.io that just addresses compiling your own Conduit binary with custom built-in connectors?

[jayjayjpg]

Also, I'm thinking if it would make sense to have a separate page on conduit.io that just addresses compiling your own Conduit binary with custom built-in connectors?

@lovromazgon I like the idea of having a dedicated page for this on conduit.io, too! Would it make sense to get this change in just for further reference until the documentation rework is completed and to add another page to the hosted conduit docs in a follow up?

This way, we'd already have some minimal documentation on this process for now in case the question about built-in connectors comes up again in the near future and we would still be able to dedicate more time on documenting this properly on conduit.io for the general audience

What do you and @simonl2002 think?

[simonl2002]

@jayjayjpg yes, lets separate this work from the work to add information to the conduit site.

[jayjayjpg]

@maha-hajja @lovromazgon Thank you for all the feedback! I just updated the branch with your suggestions, let me know what you think!

[lovromazgon]

More or less just nitpicks, all-in-all looks good 👍