chore(docs): document new options for pepr init

[samayer12]

Description

Adds documentation for pepr init

Related Issue

Fixes #1192

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (security config, docs update, etc)

Checklist before merging

• Unit, Journey, E2E Tests, docs, adr added or updated as needed
• Contributor Guide Steps followed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.73%. Comparing base (9a30baa) to head (3d0f351).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1199   +/-   ##
=======================================
  Coverage   85.73%   85.73%           
=======================================
  Files          29       29           
  Lines        1388     1388           
  Branches      288      312   +24     
=======================================
  Hits         1190     1190           
  Misses        196      196           
  Partials        2        2           

[cmwylie19]

lgtm