Update NEL emerson config options

[svlandeg]

Description

Now the NEL Emerson tutorial project shows 3 example configs:

• one with an entity_ruler
• one with a sourced ner
• one without entity recognizer (EL should still be able to train with v2)

Types of change

update

Checklist

• I confirm that I have the right to submit this contribution under the project's MIT license.
• I ran the tests, and all new and existing tests passed.
• I ran the update scripts in the .github folder, and all the configs and docs are up-to-date.