Remove Nerd Font requirements for lazy.nvim and mini.statusline

[dam9000]

Fixes #700

This has two changes:

• lazy.nvim: use unicode instead of Nerd Font icons.
• mini.statusline: disable icons for git branch, lsp, filetype (filetype icons are only enabled if nvim-web-devicons is also loaded)

For reference, the unicode icons are copied from the suggestion from:
https://github.com/folke/lazy.nvim/blob/aedcd79811d491b60d0a6577a9c1701063c2a609/README.md?plain=1#L473

If you don't want to use a Nerd Font, you can replace the icons with Unicode symbols.

[dam9000]

For reference, here is how it looks like on a ubuntu 22.04 without nerd fonts and with this change:

I personally prefer the look of Nerd Font icons, but you decide.

[joram56]

Went through the recent youtube tutorial, and I felt like nerd fonts does not really fit in with the general level of basic configurations the rest of the project does. It feels like a very user specific configuration.

[dam9000]

As suggested by @feoh, I made a new PR which makes the nerd font an optional requirement and allows you to enable it with a simple global flag, please consider merging this instead:
#716

[dam9000]

Closing this since a better alternative was merged.