Consistent casing of article titles

[lintool]

Some titles are mixed case and some are not, e.g.,

• Assessment of effective LAI and water use efficiency using Eddy Covariance data
• Mental Health Mobile Applications Developed for Indigenous Communities in Canada: A Scoping Review

This is a non-trivial detail that will probably take a fair bit to fix... @mobehbooei we should discuss the best approach...