Support user configuration of routeBasePath and path

[AnthonyBobsin]

Context

Issue #1 reported that "protodocs" is hardcoded to both the routeBasePath and the path variables passed to @docusaurus/plugin-content-docs.

Problem

The configuration of this base route and docs directory are valid use cases and should be supported.

Solution

routeBasePath

• Expose a new configuration option for docs.routeBasePath and pass to docs plugin initialization.
• Use this new config during link generation.

path

• Use protobuffet.protoDocsPath to populate path in the docs plugin initialization.

Usage

To configure a different directory for documentation to be generated (npx docusaurus generate-proto-docs), configure protobuffet.protoDocsPath. Note, this will automatically be used for the directory where docs are read from when initializing @docusaurus/plugin-content-docs.

To configure a different base route for links, configure docs.routeBasePath.

Example:

[
      'docusaurus-protobuffet',
      {
        protobuffet: {
          fileDescriptorsPath: './fixtures/proto_workspace.json',
          protoDocsPath: './protodocs',
          sidebarPath: './generatedSidebarsProtodocs.js',
        },
        docs: {
          sidebarPath: './sidebarsProtodocs.js',
          routeBasePath: 'protodocs-test',
        },
      }
 ]

[AnthonyBobsin]

FYI @ashleyvega, I've got a working solution for issue #1 here. I'll close the issue once versions are deployed and documentation updated.