docs: various updates (rebase)

[uniqueg]

• docs: add usage examples
• docs: update ZARP citation & add download button
• docs(footer): replace Twitter with X icon
• docs: fix typos & add clarifications
• docs: fix build warning

Type of change

• Documentation update

Checklist

• I have performed a self-review of my own code
• My code follows the existing coding style, lints and generates no new
  warnings
• I have added type annotations to all function/method signatures, and I
  have added type annotations for any local variables that are non-trivial,
  potentially ambiguous or might otherwise benefit from explicit typing.
• I have commented my code in hard-to-understand areas
• I have added Google-style
  docstrings
  to all new modules, classes,
  methods/functions or updated previously existing ones
• I have added tests that prove my fix is effective or that my feature
  works
• New and existing unit tests pass locally with my changes and I have not
  reduced the code coverage relative to the previous state
• I have updated any sections of the app's documentation that are affected
  by the proposed changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (4f86176) to head (df7ea9f).
Report is 5 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev       #90   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines         1264      1263    -1     
=========================================
- Hits          1264      1263    -1     

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