Link Fixes, Webb>Tangle Updates for plausible and nextra settings, favicon switch to Tangle

[thomivy]

• Repaired vector DOM-related errors in the logo and removed collapse/expand functions from the network config module.
• Fixed link to the 'Learn' folder and renamed it as 'Use' in the sidebar.
• Fixed and updated links in the Footer.
• Updated the favicon.
• Updated other links in the theme config to point to 'tangle' from 'webb'.
• Updated links to Tangle monitoring in FAQs and updated the Plausible tag to 'tangletools'.
• added Twitter follow to Testnet action.
• Fixed a few camel cases in mainnet/testnet.
• Removed the last bit of logic from the network config module for collapse/expand function.
• Edited Twitter link on network information config.
• Fixed another Twitter link.

Put an x in the boxes that apply.

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

Reference issue to close (if applicable)

Specify any issues that can be closed from these changes (e.g. Closes #233).

addresses items in #6

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Code Checklist

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

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[drewstone]

Merge conflicts here @thomivy

[thomivy]

@drewstone this is ready now