docs: Add copywriting and design tweaks (#17514)

Follow up to https://github.com/zed-industries/zed/pull/17505. This one
contains a bit more copywriting adjustments. Figured we were using the
"You can do x..." sentence shape quite frequently, so tried to kickstart
reducing that slightly. There are also more images not loading in
complement to the one I removed, but I'm not fully sure why that's the
case.

--- 

Release Notes:

- N/A

docs/src/assistant/assistant-panel.md

@@ -9,8 +9,6 @@ To open the assistant panel, toggle the right dock by using the {#action workspa
 
 Once you have [configured a provider](./configuration.md#providers), you can interact with the provider's language models in a context editor.
 
-![](https://private-user-images.githubusercontent.com/1714999/359287532-abd8f918-e65f-44ce-a853-1e90f852e206.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.NiiQkF65VvBKCJs_zNxmjpyvKGK6Hw1aIWA3Xc87XRs)
-
 To create a new context editor, press {#kb workspace::NewFile} or use the menu in the top right of the assistant panel and select the `New Context` option.
 
 In the context editor, select a model from one of the configured providers, type a message in the `You` block, and submit with {#kb assistant::Assist}.
@@ -49,7 +47,7 @@ Simple back-and-forth conversations work well with the assistant. However, there
 
 ### Editing a Context
 
-> **Note**: Wondering about Context vs Conversation? [Read more here](./contexts.md).
+> **Note**: Wondering about Context vs. Conversation? [Read more here](./contexts.md).
 
 The assistant gives you the flexibility to have control over the context. You can freely edit any previous text, including the responses from the assistant. If you want to remove a message block entirely, simply place your cursor at the beginning of the block and use the `delete` key. A typical workflow might involve making edits and adjustments throughout the context to refine your inquiry or provide additional information. Here's an example: