Deployer ADR (#149)

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#### What this PR does / why we need it

Creates a Deployment ADR that discusses the different deployer options
and why we chose which.

#### Which issue(s) this PR fixes

Closes #136

---------

Co-authored-by: ikhandamirov <[email protected]>

Author: frewilhelm

docs/adr/configuration.md

@@ -426,7 +426,7 @@ spec:
 
 The value would be used to find the relevant exchange value in the referenced
 configuration object as well. Be that a value file or a ConfigMap it isn't
-relevent.
+relevant.
 
 _Note_: We might be able to even re-name this object to something like
 MutationConfig that would perform either operation based on the referencing