Remove deprecated Draw feature and lasting references to previously deprecated Search and Post features

[Purplegaze]

Proposed Changes

• Removes code relating to the old Draw page, which has been deprecated, along with CSS and dependencies that were only used for that page, such as jscolor.min.js.
• Removes a few lasting references to the previously deprecated Search and Post features, which had their code removed in Remove search and post #1549 and Remove search and post (v2) #1558.

...

Screenshots of your changes (if applicable)

Type of Change

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Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)
🐛 Bug fix (non-breaking change that fixes an issue)
🎨 User interface change (change to user interface; provide screenshots)
♻️ Refactoring (internal change to codebase, without changing functionality)
🚦 Test update (change that only adds or modifies tests)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)	X

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Before opening your pull request:

• I have performed a self-review of my changes.
  • Check that all changed files included in this pull request are intentional changes.
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[coveralls]

Coverage Report for CI Build 36170316794

Coverage increased (+0.1%) to 59.94%

Details

• Coverage increased (+0.1%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 2 coverage regressions across 1 file.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

2 previously-covered lines in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
app/MasterTemplate.hs	2	0.0%

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Coverage Stats

Relevant Lines:	4321
Covered Lines:	2644
Line Coverage:	61.19%
Relevant Branches:	1001
Covered Branches:	546
Branch Coverage:	54.55%
Branches in Coverage %:	Yes
Coverage Strength:	156.51 hits per line

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💛 - Coveralls

[Purplegaze]

Issues relating to these deprecated features --
post: #486 #566 #580
search: #701 #702 #704 #705 #706 #707
draw: #700 #856 #919 #1045 #1077
Should these all be closed with this?