Add tags by C++ identifier

[bdeane-intel]

When I look at https://lefticus.github.io/cpp_weekly_videos/ I want to search by the C++ identifier I find on cppreference. So that when my colleagues are asking about a specific thing, I can point them to a video. e.g.

When did Jason cover C++20's safe integral comparisons? (search: cmp_equal) When did Jason cover C++20 support for deleting variable-sized classes? (search: destroying_delete) What does Jason recommend for timing? (search: high_resolution_clock)