feat: tidy up files by removing empty bullets

[andreoliwa]

The following issues are fixed by this pull request: Fix #56

Proposed changes

1. Add the tidy up command with one cleanup: empty bullets at any block level.

Checklist

• [x] Read the contribution guidelines
• [x] Add tests for the relevant parts
• [x] Write documentation when there's a new API or functionality

[codecov[bot]]

Codecov Report

Merging #63 (21e21ff) into master (3905e11) will increase coverage by 1.25%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
+ Coverage   93.61%   94.87%   +1.25%     
==========================================
  Files           4        6       +2     
  Lines          94      117      +23     
  Branches        6        7       +1     
==========================================
+ Hits           88      111      +23     
  Misses          5        5              
  Partials        1        1              

Impacted Files	Coverage Δ
src/logseq_doctor/cli.py	94.11% <100.00%> (+6.61%)	:arrow_up:
src/logseq_doctor/constants.py	100.00% <100.00%> (ø)
tests/test_outline.py	94.59% <100.00%> (ø)
tests/test_tidy_up.py	100.00% <100.00%> (ø)

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