[MINOR] Fix build failure caused by bad tag name index

[xushiyan]

Change Logs

remove problematic tag index that messed up with docusaurus generating index.html web pages.

Error:  Unable to build website for locale en.
Error:  Error: Redirect file creation error for "/home/runner/work/hudi/hudi/website/build/blog/tags/index.html/index.html" path: Error: EEXIST: file already exists, mkdir '/home/runner/work/hudi/hudi/website/build/blog/tags/index.html'.
    at writeRedirectFile (/home/runner/work/hudi/hudi/website/node_modules/@docusaurus/plugin-client-redirects/lib/writeRedirectFiles.js:76:15)
    at async Promise.all (index 238)
    at async writeRedirectFiles (/home/runner/work/hudi/hudi/website/node_modules/@docusaurus/plugin-client-redirects/lib/writeRedirectFiles.js:81:5)
    at async Object.postBuild (/home/runner/work/hudi/hudi/website/node_modules/@docusaurus/plugin-client-redirects/lib/index.js:29:13)
    at async /home/runner/work/hudi/hudi/website/node_modules/@docusaurus/core/lib/commands/build.js:153:9
    at async Promise.all (index 11)
    at async buildLocale (/home/runner/work/hudi/hudi/website/node_modules/@docusaurus/core/lib/commands/build.js:149:5)
    at async tryToBuildLocale (/home/runner/work/hudi/hudi/website/node_modules/@docusaurus/core/lib/commands/build.js:33:20)
    at async mapAsyncSequencial (/home/runner/work/hudi/hudi/website/node_modules/@docusaurus/utils/lib/index.js:262:24)
    at async build (/home/runner/work/hudi/hudi/website/node_modules/@docusaurus/core/lib/commands/build.js:68:25)
Error: Process completed with exit code 1.

Impact

Fix website build.

Risk level

None.

Documentation Update

NA

Contributor's checklist

• Read through contributor's guide
• Change Logs and Impact were stated clearly
• Adequate tests were added if applicable
• CI passed

[codope]

Good catch!