fix(curriculum): change projects hint article links (#42339)

What?
Make "Get a Hint" links of some projects to point to their
corresponding forum topics.
Ref: https://github.com/freeCodeCamp/freeCodeCamp/issues/40472#issuecomment-850496017

How?
Set `forumTopicId` in the front matter of the project files.

Closes #40472

curriculum/challenges/english/08-data-analysis-with-python/data-analysis-with-python-projects/demographic-data-analyzer.md

@@ -2,6 +2,7 @@
 id: 5e46f7e5ac417301a38fb929
 title: Demographic Data Analyzer
 challengeType: 10
+forumTopicId: 462367
 dashedName: demographic-data-analyzer
 ---
 

curriculum/challenges/english/08-data-analysis-with-python/data-analysis-with-python-projects/mean-variance-standard-deviation-calculator.md

@@ -2,6 +2,7 @@
 id: 5e46f7e5ac417301a38fb928
 title: Mean-Variance-Standard Deviation Calculator
 challengeType: 10
+forumTopicId: 462366
 dashedName: mean-variance-standard-deviation-calculator
 ---
 

curriculum/challenges/english/08-data-analysis-with-python/data-analysis-with-python-projects/medical-data-visualizer.md

@@ -2,6 +2,7 @@
 id: 5e46f7f8ac417301a38fb92a
 title: Medical Data Visualizer
 challengeType: 10
+forumTopicId: 462368
 dashedName: medical-data-visualizer
 ---
 

curriculum/challenges/english/08-data-analysis-with-python/data-analysis-with-python-projects/page-view-time-series-visualizer.md

@@ -2,6 +2,7 @@
 id: 5e46f802ac417301a38fb92b
 title: Page View Time Series Visualizer
 challengeType: 10
+forumTopicId: 462369
 dashedName: page-view-time-series-visualizer
 ---
 

curriculum/challenges/english/08-data-analysis-with-python/data-analysis-with-python-projects/sea-level-predictor.md

@@ -2,6 +2,7 @@
 id: 5e4f5c4b570f7e3a4949899f
 title: Sea Level Predictor
 challengeType: 10
+forumTopicId: 462370
 dashedName: sea-level-predictor
 ---