docs: add installation and configuration instruction for Emacs

[Ziqi-Yang]

Sorry for that I cannot run node .\scripts\link-docs.mjs to generate the corresponding README file.

❯ node .\scripts\link-docs.mjs
node:internal/modules/cjs/loader:1148
  throw err;
  ^

Error: Cannot find module '/mnt/p0/probe-temp/tinymist/.scriptslink-docs.mjs'
    at Module._resolveFilename (node:internal/modules/cjs/loader:1145:15)
    at Module._load (node:internal/modules/cjs/loader:986:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:174:12)
    at node:internal/main/run_main_module:28:49 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

Node.js v20.15.1

[Myriad-Dreamin]

In unix, you should replace the blackslashes \ in the path with slash /.

[Ziqi-Yang]

In unix, you should replace the blackslashes \ in the path with slash /.

Oh, my stupid...

[Myriad-Dreamin]

Thank you!