feat: added more help commands

docs/guide/about.md

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+# About
+
+Blitzkrieg is a multipurpose bot for anything and everything World of Tanks Blitz.
+
+- Track statistics
+- Find inactive players in a clan
+- Lookup owned tanks
+- Create embeds for streams
+- Track a player/tanks statistical evolution
+- ...and a variety of other similar things

docs/guide/embeds.md

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+# Embeds
+
+Embeds are generated by a few commands as a URL that can be loaded in a browser/streaming software.
+
+## Creating Embeds
+
+1. Use a command of your liking (for example, `/stats`).
+2. Customize the command however you like and the URL generated for the embed will match your needs.
+3. Send the command and when the bot is "done thinking," an "Embed" button will appear below the bot's reply.
+
+## Using Embeds in Streaming Softwares
+
+1. Click on the "Embed" button.
+2. Copy the URL from your browser.
+3. Paste the URL into a Browser Source.
+4. Set the refresh rate/FPS to something very low like `0.0167` (that's 1 frame every 60 seconds).
+
+## How Embeds Behave
+
+- They load like any normal website albeit with a significant delay.
+- They auto refresh every `60s`.
+- All embeds and images generated by Blitzkrieg have a width of `640px` but the height varies and must be found manually through trial and error.
+  - It's okay to have a Browser Source that has a height larger than needed as Blitzkrieg embeds are transparent.

docs/guide/invite.md

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+# Inviting the Bot
+
+It's quite simple really. Just follow the steps below:
+
+1. Join a Discord server that already has Blitzkrieg installed or [the official Discord Server](https://discord.gg/nDt7AjGJQH).
+2. Click on the bot's profile.
+3. Click the "Add to Server" button under the bot's name and ID.
+4. Select what server you want it in and see what permissions you seem fit for the bot.
+
+Voila! You're ready to go.