Fixed web plugin favicons, binary size reduction, perf optimizations

[mmstick]

• Enable LTO, panic=abort, set strip-true by default to reduce binary size
• Swap the default system allocator for mimalloc, which is 2.6x faster and more secure
• Fixed the symbolic link names installed by the justfile
• Fixed missing favicons on some websites, like Amazon
  • It seems Google isn't correctly checking the root of a domain for the favicon anymore

Binary size should now be reduced from ~8MB to ~6MB, which is shared memory to all plugins.

Closes #98

[jacobgkau]

This fixes favicon caching for Amazon and Crates.io. However, it breaks the icon for Flathub.

Interestingly, the DEV icon has changed. Before, it used the same favicon that Firefox recognizes:

After, it's different:

[mmstick]

Seems to be the icon they're using here: https://dev.to/favicon.ico

[jacobgkau]

Seems to be the icon they're using here: https://dev.to/favicon.ico

They have their shortcut icon set to a favicon.ico on a different domain:

[jackpot51]

• Swap reqwest for ureq for significant reduction in dependencies and binary size

I do not recommend this. I have noticed reqwest has better performance than ureq.

[mmstick]

I've reverted the change to keep reqwest

[jacobgkau]

Amazon and Crates.io are showing the Google API's default favicon instead of their own icons again on 09d126e.

[mmstick]

Seems the correct order would be first scraping the page for the favicon path, then checking the root path, and falling back on Google as a last resort.

[jacobgkau]

On ca4eec7, the lib.rs and ArXiv icons don't load:

The dev icon doesn't load, and doesn't show a placeholder space either, and it shows a backtrace:

[jacobgkau]

On e5f381b, all favicons are showing as expected again. Regression testing passed:
launcher-pr97-impish.txt
launcher-pr97-focal.txt