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

Cooldowns can be used in discord.py to rate-limit. In this example, we're using it in an on_message.

from discord.ext import commands

message_cooldown = commands.CooldownMapping.from_cooldown(1.0, 60.0, commands.BucketType.user)

@bot.event
async def on_message(message):
    bucket = message_cooldown.get_bucket(message)
    retry_after = bucket.update_rate_limit()
    if retry_after:
        await message.channel.send(f"Slow down! Try again in {retry_after} seconds.")
    else:
        await message.channel.send("Not ratelimited!")

from_cooldown takes the amount of update_rate_limit()s needed to trigger the cooldown, the time in which the cooldown is triggered, and a BucketType.