Add tBTC SDK Page

[evandrosaturnino]

Description

Add the tBTC SDK landing page to the website with multiple sections - Updated navbar to accommodate a new category for the upcoming Threshold products, starting with the tBTC SDK (thUSD and TACo).

• [x] Add tbtc sdk landing page
• [x] Fix integration component margin
• [x] Refactor nav bar menu content

Figma's design prototype: https://www.figma.com/file/5eN3hPMkCVOpXb5YQw6CtB/tBTC-SDK?type=design&node-id=1264%3A185&mode=design&t=btHMRHkFwM2x8nJN-1

Notice

• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Pull Request Type

• [x] New Feature (Breaking/Non-breaking Change)

Issue (if applicable)

Closes issue https://github.com/threshold-network/website/issues/90

Testing

Please outline all testing steps

1. Clone the repo - git clone https://github.com/threshold-network/website.git
2. Install dependencies - yarn install
3. Run the app - yarn start

Screenshots (if applicable)

For mobile:

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Preview uploaded to https://preview.threshold.network/tbtc-sdk-page/index.html.

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Preview uploaded to https://preview.threshold.network/tbtc-sdk-page/index.html.

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Preview uploaded to https://preview.threshold.network/tbtc-sdk-page/index.html.

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Preview uploaded to https://preview.threshold.network/tbtc-sdk-page/index.html.

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Preview uploaded to https://preview.threshold.network/tbtc-sdk-page/index.html.

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Preview uploaded to https://preview.threshold.network/tbtc-sdk-page/index.html.

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Preview uploaded to https://preview.threshold.network/tbtc-sdk-page/index.html.

[github-actions[bot]]

Preview uploaded to https://preview.threshold.network/tbtc-sdk-page/index.html.