* fix: add solution for invert binary tree * Fixed errors * Used 2 spaces per request * deleted images * Update guide/english/certifications/coding-interview-prep/data-structures/invert-a-binary-tree/index.md Co-Authored-By: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * Update guide/english/certifications/coding-interview-prep/data-structures/invert-a-binary-tree/index.md Co-Authored-By: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * Update guide/english/certifications/coding-interview-prep/data-structures/invert-a-binary-tree/index.md Co-Authored-By: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * Update guide/english/certifications/coding-interview-prep/data-structures/invert-a-binary-tree/index.md Co-Authored-By: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * fix: added extra line to avoid linting errors