Update user stories and use cases in dg for v1.2

[CelestineTan03]

Closes #84

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[codecov]

Codecov Report

Merging #85 (97cccac) into master (a68e10c) will decrease coverage by 0.45%.
Report is 15 commits behind head on master.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #85      +/-   ##
============================================
- Coverage     76.11%   75.66%   -0.45%     
+ Complexity      447      446       -1     
============================================
  Files            74       75       +1     
  Lines          1407     1418      +11     
  Branches        133      134       +1     
============================================
+ Hits           1071     1073       +2     
- Misses          303      311       +8     
- Partials         33       34       +1     

see 2 files with indirect coverage changes

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[craigtonlian]

Thanks for adapting it to the new use case! It looks good 🔥 🚒 🚒