Removed several Matrix chat room links from the README and streamlined
the list of instances to enhance readability and maintain a focus on
primary resources. Updated footer source code references to point to a
singular, official repository for increased clarity and to reflect the
project's centralization efforts. This change should make the
documentation less cluttered and more user-friendly for new
contributors.
Updated the project name and references across various files, including README, template headers, and footers to reflect the rebranding from 'Indestructables' to 'Structables'. The favicon has been removed, and the main logo updated to align with the new branding. The commit modifies links to the source code repository as part of rebranding efforts. This change creates a clear distinction from the upstream project while maintaining acknowledgments to the original sources.
