change: [M3-7359] - Move Linode Details Add/Edit Config button alignment to the right

[coliu-akamai]

Description 📝

• Moves the edit/add config action panel's buttons to the right to be more consistent
• also moved config's styles to a separate file to be in line with our styling guidelines (since file is >100 lines)

Preview 📷

Before	After

How to test 🧪

Prerequisites

• Navigate to a Linode's detail page, on the Configs tab

Verification steps

• Verify that the buttons are on the right side of the panel in a) Add Config panel and b) Edit config panel
• Verify there are no other style regressions

As an Author I have considered 🤔

Check all that apply

• 👀 Doing a self review
• ❔ Our contribution guidelines
• 🤏 Splitting feature into small PRs
• ➕ Adding a changeset
• 🧪 Providing/Improving test coverage
• 🔐 Removing all sensitive information from the code and PR description
• 🚩 Using a feature flag to protect the release
• 👣 Providing comprehensive reproduction steps
• 📑 Providing or updating our documentation
• 🕛 Scheduling a pair reviewing session
• 📱 Providing mobile support
• ♿ Providing accessibility support

[tyler-akamai]

LGTM!