Updated to Discord.js v14

[eirikhanasand]

• Closes 🐛 Bug: Application does not respond when querying MDN docs. #21
• Closes 🔧 Chore: Outdated packages and discordjs version #23
• Updated to discord.js v14
• Added varius refactors necesarry by v14 breaking changes
• Fixed issues in discord.js-docs library by submitting a pr to the actual library instead of a non-maintained fork

[khinshankhan]

Why was pm2 removed?

[eirikhanasand]

Because it was installed but there is no reference to it in the code, nor is it referenced by any other dependency neither top level nor sublevel nor any script nor the dockerfile. In other words, I found no indication that it was being used. Saw no reason to include it when it isnt used.

[eirikhanasand]

Added a commit for discord.js-docs v 0.4.3 which was published earlier today, where an issue in that library that caused a top level error was resolved (see TeeSeal/discord.js-docs#30). I also changed the default query "Client" to "a", and moved this to constants.ts and named it DEFAULT_SEARCH_QUERY to make it more explicit what the role of this variable is. Previous to this PR there was no default query, which resulted in no results appearing before you started typing. I feel like an alphabetically ordered list is better than just "Client" appearing, which was why I changed it to just "a".

[eirikhanasand]

Added DEFAULT_SEARCH_QUERY for mdn docs as well (this was already "a", but now refers to the same constant instead of just a inline char. Also moved the DJSAutocomplete from InteractionCreateHandler.ts -> commands/docs/djs.ts to ensure both files follow the same structure.