* feat(examples/*): add readme
Add README.md to all examples.
* fix(examples): logo image link
* fix(examples): add fixed width to logo
* feat(examples): add titles
* fix(examples/*): make logo smaller
Make DiscordGo logo smaller to match description and title in size.
* fix(examples/avatar): correct avatar url
Use correct logo URL in avatar URL image example.
* fix(examples/slash_commands): wording
Fix wording of "step-by-step tutorial" note.
