feat(upgrade): add v0.5.3 upgrade proposal and fix deterministic emis…

[MudDev]

This pull request introduces several improvements and updates across documentation, build tooling, and workflows to align the project with the new EpixChain branding and the v0.6.0 upgrade. Key changes include updating the build system and documentation to use epixd instead of evmd, enhancing the documentation configuration, and improving CI workflows for better dependency management and compatibility.

Build System and Naming Updates:

• Updated the Makefile and related scripts to use epixd as the main binary name instead of evmd, including build, install, test, and coverage commands. This also updates Docker and localnet references to epixd.

Documentation and Configuration:

• Added a comprehensive .gitdocs.yml configuration file for the documentation generator, specifying site details, navigation, theme, plugins, markdown extensions, and social links for EpixChain.
• Updated the changelog (CHANGELOG.md) to document the v0.6.0 EpixChain upgrade, including improvements, API-breaking changes, and state migrations.

Continuous Integration and Workflow Improvements:

• Enhanced the Solidity test workflow by adding Node.js setup and caching for yarn dependencies to speed up CI builds.
• Updated the Buf Schema Registry workflow to point to the new EpixChain registry location.

Linting and Formatting:

• Adjusted markdown linting rules in .markdownlint.yml to allow longer lines and disable line length checks for code blocks and tables, improving documentation formatting flexibility.# Description