"merge" of some of the changes to luke's branch

[kavigupta]

After #259: 50 files changed, 2153 insertions(+), 2988 deletions(-)
After #261: 41 files changed, 1886 insertions(+), 2681 deletions(-)
After #265: 34 files changed, 1729 insertions(+), 2534 deletions(-)
After #266: 28 files changed, 1313 insertions(+), 1868 deletions(-)
After #275: 28 files changed, 1313 insertions(+), 1854 deletions(-)
After #271: 25 files changed, 1173 insertions(+), 1844 deletions(-)

 react/src/about.js                                   |  52 -----------------
 react/src/about.tsx                                  |  46 +++++++++++++++
 react/src/{article.js => article.tsx}                |  10 +---
 react/src/comparison.js                              |  16 +----
 react/src/components/article-panel.js                | 128 ----------------------------------------
 react/src/components/article-panel.tsx               |  89 ++++++++++++++++++++++++++++
 react/src/components/comparison-panel.js             | 460 -----------------------------------------------------------------------------------------------------------------------------------------------
 react/src/components/comparison-panel.tsx            | 397 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 react/src/components/header.tsx                      |  13 +++--
 react/src/components/map.tsx                         |   6 +-
 react/src/components/mapper-panel.js                 | 389 -------------------------------------------------------------------------------------------------------------------------
 react/src/components/mapper-panel.tsx                | 373 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 react/src/components/related-button.tsx              |  30 +++++-----
 react/src/components/search.tsx                      | 259 +++++++++++++++++++++++++++++---------------------------------------------------
 react/src/components/sidebar.tsx                     |  21 ++++---
 react/src/components/statistic-panel.js              | 305 -----------------------------------------------------------------------------------------------
 react/src/components/table.tsx                       |  13 ++---
 react/src/data-credit.js                             |  30 +++++-----
 react/src/page_template/{settings.ts => Settings.ts} |  15 +++--
 react/src/page_template/template.js                  | 172 ------------------------------------------------------
 react/src/page_template/template.tsx                 |  64 ++++++++++++++++++++
 react/src/quiz/quiz-components.js                    |   5 +-
 react/src/quiz/quiz-question.js                      |   7 ++-
 react/src/statistic.js                               |  65 ---------------------
 react/src/utils/responsive.ts                        |  52 ++++++++++-------