[docs-infra] Simplify Algolia crawler config

[oliviertassinari]

See the last issue in https://groups.google.com/a/mui.com/g/docs-infra/c/81eISb5eXmA. Once MUI X sync with these changes, we should be able to simplify the crawler config:

        const result = helpers.docsearch({
          recordVersion: "v3",
          recordProps: {
            lvl0: {
              selectors: ".this-selector-will-never-match",
              defaultValue: $(".algolia-lvl0")
                .map((index, element) => $(element).text())
                .get()
                .join(" > "),
            },
            lvl1: [".algolia-lvl1", ".markdown-body h1"],
            lvl2: [".algolia-lvl2", ".markdown-body h2"],
            lvl3: [
              ".algolia-lvl3",
              ".markdown-body h3",
              ".markdown-body td:first-of-type",
            ],
            lvl4: [".algolia-lvl4", ".markdown-body h4"],
            content:
              ".algolia-content, .markdown-body p, .markdown-body li, .markdown-body td:last-of-type",
          },
        });

Part of the value is to be able to change the DOM structure without breaking the crawler, especially when spread between different deployment units (Base UI, Material UI, MUI X almost never using the same version of docs-infra at any moment in time)

[mui-bot]

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