Making the settings configurable

[ZvonimirMatic]

I think the settings could be more configurable. I don't see the reason for only one constructor with required parameters. In my opinion most of the properties should be able to be set publicly with some default values. This would allow for appsettings.json configuration. Also it would be very useful to be able to control certain parameters such as SqliteDbPath.

The interface ISejilSettings seems unnecessary.

If you want I can help you with the changes, but I would like your opinion first.

Other than that, it' a great library you've built!

[ZvonimirMatic]

I started working on it, but I can't build the Client application. Tried npm install - got an error so tried npm install --force, but then running npm run build breaks with th following error:

> sejil-ui@0.1.0 build
> react-app-rewired build

node:internal/modules/cjs/loader:535
      throw e;
      ^

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './lib/tokenize' is not defined by "exports" in C:\projects\Sejil\src\Sejil.Client\node_modules\postcss-safe-parser\node_modules\postcss\package.json
    at new NodeError (node:internal/errors:393:5)
    at throwExportsNotFound (node:internal/modules/esm/resolve:358:9)
    at packageExportsResolve (node:internal/modules/esm/resolve:668:3)
    at resolveExports (node:internal/modules/cjs/loader:529:36)
    at Module._findPath (node:internal/modules/cjs/loader:569:31)
    at Module._resolveFilename (node:internal/modules/cjs/loader:981:27)
    at Module._load (node:internal/modules/cjs/loader:841:27)
    at Module.require (node:internal/modules/cjs/loader:1061:19)
    at require (node:internal/modules/cjs/helpers:103:18)
    at Object.<anonymous> (C:\projects\Sejil\src\Sejil.Client\node_modules\postcss-safe-parser\lib\safe-parser.js:1:17) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}

Node.js v18.12.1