Add doc option

[Chemaclass]

📚 Description

Right now all assertions can be found in the website https://bashunit.typeddevs.com/assertions
The goal is to enable finding those assertions from the ./bashunit directly

🔖 Changes

• Add --doc [filter] option

✅ To-do list

• I updated the CHANGELOG.md to reflect the new feature or fix
• I updated the documentation to reflect the changes

🖼️ Demo

⚠️ Problem

The current problem is that the built is a standalone executable, so there is no access to "docs/assertions.md"... we have to find another way 🤔

[antonio-gg-dev]

Maybe during the build, assert.md could be processed and embedded into the final binary.

[antonio-gg-dev]

Or perform a curl to download it from the internet if it hasn’t been done beforehand.

[Chemaclass]

@antonio-gg-dev I want to avoid using curl, because I dont want to depend on internet to render documentation.
As you suggested, I will explore this week: embed the assertions.md docs into a function in the bin result on the build step. Then it can be pretty simple to read and manipulate the data from there 🧠