Update Hubble Bridge Docs, Fix Search and Improve UI

[AtelyPham]

Summary of changes

• Fix the document searching issue
• Docs Site's Sidebar Renders too narrow on Mobile.
• Upgrade Repository to Use Node 18 as Node 16 Is Now Deprecated
• Revise Hubble Bridge Content and Imagery for Migration to Version 2

Proposed area of change

• [ ] Overview
• [ ] Anchor System
• [x] dApps
• [ ] Tangle
• [ ] Protocols
• [ ] Relayers

Reference issue to close (if applicable)

• Closes https://github.com/webb-tools/webb-dapp/issues/1623
• Closes https://github.com/webb-tools/webb-dapp/issues/1377
• Closes https://github.com/webb-tools/webb-docs/issues/132
• Closes https://github.com/webb-tools/webb-docs/issues/133

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Code Checklist

• [x] I have tested that prove my changes are working as intended
• [x] I have added necessary documentation (if appropriate)

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[monaiuu]

We might want to keep this issue open, I am still in the process of auditing the texts.

[drewstone]

Ok sounds good @monaiuu