Add support for Safari extensions

[mehaase]

• Restructure the project to facilitate support for building extensions for different browsers.
• Add support for Safari extension.
• Separate developer docs out of main README into new file.

[codecov[bot]]

Codecov Report

Patch coverage: 3.12% and project coverage change: -0.32 :warning:

Comparison is base (36af743) 63.72% compared to head (456f9b2) 63.41%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #33 +/- ## ========================================== - Coverage 63.72% 63.41% -0.32% ========================================== Files 17 17 Lines 692 697 +5 Branches 99 100 +1 ========================================== + Hits 441 442 +1 - Misses 251 255 +4 ``` | [Impacted Files](https://codecov.io/gh/center-for-threat-informed-defense/attack-powered-suit/pull/33?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=center-for-threat-informed-defense) | Coverage Δ | | |---|---|---| | [src/BookmarksPanel.svelte](https://codecov.io/gh/center-for-threat-informed-defense/attack-powered-suit/pull/33?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=center-for-threat-informed-defense#diff-c3JjL0Jvb2ttYXJrc1BhbmVsLnN2ZWx0ZQ==) | `56.81% <0.00%> (-1.33%)` | :arrow_down: | | [src/sleep.js](https://codecov.io/gh/center-for-threat-informed-defense/attack-powered-suit/pull/33?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=center-for-threat-informed-defense#diff-c3JjL3NsZWVwLmpz) | `100.00% <ø> (ø)` | | | [src/worker.js](https://codecov.io/gh/center-for-threat-informed-defense/attack-powered-suit/pull/33?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=center-for-threat-informed-defense#diff-c3JjL3dvcmtlci5qcw==) | `0.00% <0.00%> (ø)` | | | [src/SearchResults.svelte](https://codecov.io/gh/center-for-threat-informed-defense/attack-powered-suit/pull/33?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=center-for-threat-informed-defense#diff-c3JjL1NlYXJjaFJlc3VsdHMuc3ZlbHRl) | `21.12% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=center-for-threat-informed-defense). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=center-for-threat-informed-defense)

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