Include embed titles in all tags (#2419)

* Add title and remove heading

+ also changed any mentioning of `!tags` command

* Fixed yaml scan errors

+ using tabs instead of spaces

+ enclosed title in `comparison.md` with quotes

* Implement ChrisLovering reviews

+ changed all "Name1 vs. Name2" to "Name1 vs. name2"

+ changed "python discord" to "Python Discord" in titles

+ fix typos

+ reverting hunk for `dotenv.md`

+ changed all title cases to sentence cases

* fix grammar

+ changed "embed" to "embeds"

* remove other ot channels mentioned except ot2

* Fix mistakenly removing a blank line

Do you ever find yourself writing something like this?

>>> squares = []
>>> for n in range(5):
...    squares.append(n ** 2)
[0, 1, 4, 9, 16]

Using list comprehensions can make this both shorter and more readable. As a list comprehension, the same code would look like this:

>>> [n ** 2 for n in range(5)]
[0, 1, 4, 9, 16]

List comprehensions also get an if clause:

>>> [n ** 2 for n in range(5) if n % 2 == 0]
[0, 4, 16]