refactor(XSS_Filter_Evasion): #1321 Suggestions (#1327)

* refactor(XSS_Filter_Evasion): #1321 Suggestions

- Adds changes from suggestions to 143755d and #1321

Signed-off-by: otkd <7527203+otkd@users.noreply.github.com>

* chore(XSS_Filter_Evasion): legacy cleanup

- Removes rest of Netscape and Flash scripts
- Add codeblocks
- Style for uniformity

Signed-off-by: otkd <7527203+otkd@users.noreply.github.com>

* fix(Authentication): trim whitespace

- For linter

Signed-off-by: otkd <7527203+otkd@users.noreply.github.com>

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Signed-off-by: otkd <7527203+otkd@users.noreply.github.com>