Update footer with copyright notices

[rdhar]

This pull request updates branding, copyright, and minor content across the site and documentation. The main focus is on unifying the use of the interpunct (·) in the HotFix.Day tagline, updating footer and licensing information, and making minor markdown and style guide improvements.

Branding and Copyright Updates:

• Updated the HotFix.Day tagline from an em dash (—) to an interpunct (·) in README.md, package.json, and src/consts.ts for consistency across the project. [1] [2] [3]
• Replaced the generic footer text in src/components/Footer.astro with detailed copyright, author, and licensing information, including links to the site, author, code license, and content license.
• Improved formatting of SVG icons in the footer for better readability and maintainability. [1] [2]

Documentation and Content Improvements:

• Added a copyright and licensing section to the end of README.md.
• Made minor improvements in the markdown style guide, such as clarifying heading syntax, using an em dash HTML entity for blockquotes, and updating section titles for clarity. [1] [2] [3]

[chatgpt-codex-connector]

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