Use remark.process instead of remark.processSync

[trmjoa]

Hi,

I have been using the typedoc-plugin-markdown plugin for some time and stubled across a problem where I needed to rewrite relative links from myMarkDownFile.md to ./myMarkDownFile.md. In my attempt to find a solution to do that I came across the next branch of your repository.

While trying it out, I encountered this error:

Error: `processSync` finished async. Use `process` instead
    at assertDone (file:///Users/<retracted>javascript/core-api/node_modules/unified/lib/index.js:1273:11)
    at Function.processSync (file:///Users/<retracted>/javascript/core-api/node_modules/unified/lib/index.js:820:5)
    at parseContents (/Users/<retracted>/javascript/core-api/node_modules/typedoc-plugin-remark/dist/remark.cjs:35:15)
    at async /Users/<retracted>/javascript/core-api/node_modules/typedoc-plugin-remark/dist/index.js:75:24
    at async Promise.all (index 0)
    at async /Users/<retracted>/javascript/core-api/node_modules/typedoc-plugin-remark/dist/index.js:72:13
    at async Promise.all (index 0)
    at async _classThis.render (/Users/<retracted>/javascript/core-api/node_modules/typedoc-plugin-markdown/dist/app/renderer/overrides.js:117:9)
    at async _classThis.generateDocs (/Users/<retracted>/javascript/core-api/node_modules/typedoc-plugin-markdown/dist/app/renderer/overrides.js:45:5)
    at async run (/Users/<retracted>/javascript/core-api/node_modules/typedoc/dist/lib/cli.js:118:13)

I have no idea if this fits into your plans, or if its the correct solution, but this PR changes the usage of remark to utilise the process(async) function instead of processSync.

Merge it if its helps you, or discard it if that suits you better :)

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Name	Status	Preview	Comments	Updated (UTC)
typedoc-plugin-markdown	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 23, 2024 8:18pm

[tgreyuk]

Thats interesting - thanks.