Add welcome message config option to the docs (#435)

[jsnow42]

Description

Add welcome message config option to the docs

Fixes #435

Status

READY

Type of change

• Documentation (fix or adds documentation)

How Has This Been Tested?

not applicable

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Merging #438 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #438   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          18     18           
  Lines        1077   1077           
=====================================
  Hits         1077   1077

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[jacobtomlinson]

Thanks!