feat: change rules, metrics and anti-patterns doc urls for website urls

[incendial]

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix
[ ] New rule
[ ] Changes an existing rule
[ ] Add autofixing to a rule
[ ] Add a CLI option
[X] Add something to the core
[ ] Other, please explain:

[codecov-commenter]

Codecov Report

Merging #414 (61c968f) into master (12bffdf) will increase coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head 61c968f differs from pull request most recent head ca29449. Consider uploading reports for the commit ca29449 to get more accurate results

@@            Coverage Diff             @@
##           master     #414      +/-   ##
==========================================
+ Coverage   81.11%   81.16%   +0.04%     
==========================================
  Files         169      174       +5     
  Lines        3792     3801       +9     
==========================================
+ Hits         3076     3085       +9     
  Misses        716      716              

Impacted Files	Coverage Δ
.../analyzers/lint_analyzer/metrics/metric_utils.dart	100.00% <ø> (ø)
...src/analyzers/lint_analyzer/rules/models/rule.dart	100.00% <ø> (ø)
...always_remove_listener/always_remove_listener.dart	100.00% <ø> (ø)
...es_list/avoid_late_keyword/avoid_late_keyword.dart	100.00% <ø> (ø)
...d_non_null_assertion/avoid_non_null_assertion.dart	100.00% <ø> (ø)
...tespace_false/avoid_preserve_whitespace_false.dart	100.00% <ø> (ø)
...oid_returning_widgets/avoid_returning_widgets.dart	100.00% <ø> (ø)
...necessary_setstate/avoid_unnecessary_setstate.dart	100.00% <ø> (ø)
...oid_unused_parameters/avoid_unused_parameters.dart	100.00% <ø> (ø)
...wrapping_in_padding/avoid_wrapping_in_padding.dart	100.00% <ø> (ø)
... and 31 more

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