fix(docs): add mdn links

[imranbarbhuiya]

Please describe the changes this PR makes and why it should be merged:

Status and versioning classification:

• This PR only includes non-code changes, like changes to documentation, README, etc.

[codecov-commenter]

Codecov Report

Merging #27 (dd642e7) into main (f544fa2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   99.29%   99.29%           
=======================================
  Files          46       46           
  Lines         706      706           
  Branches      148      148           
=======================================
  Hits          701      701           
  Misses          5        5           

Impacted Files	Coverage Δ
...gscript-plugin-discord/src/lib/Transformer/Base.ts	93.75% <ø> (ø)
...script-plugin-discord/src/lib/Transformer/Guild.ts	100.00% <ø> (ø)
...-plugin-discord/src/lib/Transformer/GuildMember.ts	100.00% <ø> (ø)
...scord/src/lib/Transformer/GuildTextBasedChannel.ts	100.00% <ø> (ø)
...gscript-plugin-discord/src/lib/Transformer/Role.ts	100.00% <ø> (ø)
...gscript-plugin-discord/src/lib/Transformer/User.ts	100.00% <ø> (ø)

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