chore(cleanup): deleted deprecated files and folders

[VRamakrishna]

• Deleted 'docs-cactus' and 'weaver/docs' folders.
• Ensured that the latest contents in the above are reflected in the 'docs' folder.
• Updated MAINTAINERS.md file with contents from 'weaver/MAINTAINERS.md'.
• Deleted unnecessary 'MAINTAINERS.md' and 'CONTRIBUTING.md' in the 'weaver' folder.
• Fixed indentations and removed dead code in source files.

Pull Request Requirements

• Rebased onto upstream/main branch and squashed into single commit to help maintainers review it more efficient and to avoid spaghetti git commit graphs that obfuscate which commit did exactly what change, when and, why.
• Have git sign off at the end of commit message to avoid being marked red. You can add -s flag when using git commit command. You may refer to this link for more information.
• Follow the Commit Linting specification. You may refer to this link for more information.

Character Limit

• Pull Request Title and Commit Subject must not exceed 72 characters (including spaces and special characters).
• Commit Message per line must not exceed 80 characters (including spaces and special characters).

A Must Read for Beginners
For rebasing and squashing, here's a must read guide for beginners.

[VRamakrishna]

@outSH @petermetz I reviewed the changes in docs-cactus since the new documentation pages were created (https://github.com/hyperledger/cacti/commits/main/docs-cactus) and noticed that some of them were not reflected in the docs folder. I tried to update the contents of the docs folder as best I could. Please check for accuracy.

@sandeepnRES Please review to ensure that I haven't inadvertently deleted necessary docs or artifacts.

[sandeepnRES]

LGTM just one minor comment.