Replace colorama with rich and support all of rich's colors

[micahellison]

Use Case/Motivation

We use two different libraries for formatting jrnl's output: colorama and rich. Over the past few years, we've been replacing other display dependencies (such as ansiwrap #1191) with rich's functionality, in part because rich was better-maintained than the alternatives, but also because it's just simpler to have less dependencies.

rich already supports all the colors we list in the config reference along with a lot more, so this shouldn't be a breaking change. Also, it won't completely remove colorama in all cases as it is a sub-dependency of some dev dependencies, but at least we won't be managing a direct dependency to it.

Example Usage

n/a - jrnl calls will be the same, except the color config keys should support rich's list of colors

Other Information

A resolution to this issue should include:

• removal of colorama dependency
• a change to the coloring code (currently in Entry.py, though someday I hope to find it a new home) to use rich instead of colorama
• a change to the config file reference documentation to include (or maybe just link to) rich's list of colors
• tests as needed