update docs

[srmnitc]

This pull request updates documentation and example files in the examples directory, primarily to fix outdated links and correct inconsistencies in example numbering and descriptions.

Documentation updates:

• examples/example_01/analysis.ipynb: Updated the link to the input file description to point to the correct online documentation (https://calphy.org/en/latest/inputfile.html).

Example cleanup:

• examples/example_02/README.md: Removed an outdated link to the example's analysis documentation.
• examples/example_03/README.md: Removed the example description and outdated link to its analysis documentation.
• examples/example_05/README.md: Removed incorrect example numbering and outdated link to the analysis documentation for Example 04.
• examples/example_05/analysis.ipynb: Corrected the example number in the title from "Example 04" to "Example 05" to match the file's content.