feat(website): use dropdowns for overloads

[suneettipirneni]

I'll reduce code duplication in a followup.

[vercel]

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Name	Status	Preview	Updated
discord-js	✅ Ready (Inspect)	Visit Preview	Sep 17, 2022 at 0:09AM (UTC)

[codecov]

Codecov Report

Merging #8630 (1b18451) into main (1d72663) will increase coverage by 7.45%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #8630      +/-   ##
==========================================
+ Coverage   79.05%   86.50%   +7.45%     
==========================================
  Files          48       87      +39     
  Lines        5585     8672    +3087     
  Branches      700     1110     +410     
==========================================
+ Hits         4415     7502    +3087     
  Misses       1128     1128              
  Partials       42       42              

Flag	Coverage Δ
builders	100.00% <ø> (?)
collection	100.00% <ø> (ø)
proxy	74.10% <ø> (ø)
rest	91.99% <ø> (ø)
utilities	100.00% <ø> (ø)
voice	63.86% <ø> (ø)
ws	60.47% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ionCommandOptionWithChoicesAndAutocompleteMixin.ts	100.00% <0.00%> (ø)
.../src/interactions/slashCommands/options/boolean.ts	100.00% <0.00%> (ø)
.../interactions/slashCommands/options/mentionable.ts	100.00% <0.00%> (ø)
.../src/interactions/slashCommands/options/channel.ts	100.00% <0.00%> (ø)
...ixins/ApplicationCommandOptionChannelTypesMixin.ts	100.00% <0.00%> (ø)
...ApplicationCommandNumericOptionMinMaxValueMixin.ts	100.00% <0.00%> (ø)
...s/src/interactions/slashCommands/options/number.ts	100.00% <0.00%> (ø)
...es/builders/src/components/textInput/Assertions.ts	100.00% <0.00%> (ø)
...actions/slashCommands/mixins/NameAndDescription.ts	100.00% <0.00%> (ø)
.../src/interactions/slashCommands/options/integer.ts	100.00% <0.00%> (ø)
... and 29 more

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[imranbarbhuiya]

only 1st overload is showing code highlight

[suneettipirneni]

only 1st overload is showing code highlight

This seems to be an issue outside the scope of this PR as it happens on the live website as well.