Consolidate the three Dijkstra implementations and remove the misplaced copy in `others/`

[DenizAltunkapan]

Description

Dijkstra's shortest-path algorithm is currently implemented three times:

• others/Dijkstra.java
• datastructures/graphs/DijkstraAlgorithm.java
• datastructures/graphs/DijkstraOptimizedAlgorithm.java

The copy in others/ is also misplaced — graph algorithms belong under datastructures/graphs/.

Proposed change

• Remove the duplicate in others/ (keeping its tests/edge cases if they add coverage).
• Keep a single canonical Dijkstra under datastructures/graphs/.

Note: the choice between the "Algorithm" and "Optimized" variants is tracked separately in a companion issue about unifying on the efficient priority-queue implementation.

[priyanshuvishwakarma273403]

Hi maintainers,

I have really enjoyed contributing to this project and learning from the community. I would like to become a more active contributor and help with development, documentation, issue triage, and community support whenever possible.

If there is a contributor program, community team, or any pathway toward greater involvement within the organization, I would be grateful for the opportunity to participate.

Thank you for maintaining this amazing project. I look forward to contributing more.

[DenizAltunkapan]

@priyanshuvishwakarma273403 Hi,
thanks for reaching out and for your interest in contributing more actively.
If you would like to discuss contribution ideas, collaboration, or other open-source projects I’m involved in, feel free to contact me on Discord.

Current Discord: deniz_alt
Previous Discord tag: deniz.styx#1341

Best regards,
Deniz

[Sim20004]

Issue resolved in commit d4ffef7 - can be closed.