[skip ci] Add Algolia crawler config and info

algolia-search/README.md

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+# Algolia with Rancher Manager Documentation
+
+The search index used by the Rancher Manager documentation is generated by [running our own crawler](https://docsearch.algolia.com/docs/legacy/run-your-own).
+
+## Running the Crawler
+
+To run the crawler, you'll need:
+- A configuration file, which can be found [here](./config.json).
+- An `.env` file, containing your credentials.
+
+```
+APPLICATION_ID=<app_id>
+API_KEY=<key_with_write_permissions>
+```
+
+If you're running the crawler from the Docker image, run:
+
+```
+docker run -it --env-file=.env -e "CONFIG=$(cat ./config.json | jq -r tostring)" algolia/docsearch-scraper
+```
+
+Otherwise, follow [these instructions](https://docsearch.algolia.com/docs/legacy/run-your-own#running-the-crawler-from-the-code-base) if running the crawler using the code base.

algolia-search/config.json

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+{
+    "index_name": "docs_ranchermanager_rancher_io",
+    "sitemap_urls": ["http://docs.ranchermanager.rancher.io/sitemap.xml"],
+    "start_urls": ["http://docs.ranchermanager.rancher.io/"],
+    "selectors": {
+      "lvl0": "",
+      "lvl1": "article h1",
+      "lvl2": "article h2",
+      "lvl3": "article h3",
+      "lvl4": "article h4",
+      "lvl5": "article h5"
+    },
+    "custom_settings": {
+      "attributesForFaceting": [
+        "language",
+        "version",
+        "type",
+        "docusaurus_tag"
+      ]
+    }
+  }