Update LS docs index page with subsections

[IMS94]

Purpose

$subject

Approach

Describe how you are implementing the solutions along with the design details.

Samples

Provide high-level details about the samples related to this feature.

Remarks

List any other known issues, related PRs, TODO items, or any other notes related to the PR.

Check List

• [ ] Read the Contributing Guide
• [ ] Updated Change Log
• [ ] Checked Tooling Support (#<Issue Number>)
• [ ] Added necessary tests
  • [ ] Unit Tests
  • [ ] Spec Conformance Tests
  • [ ] Integration Tests
  • [ ] Ballerina By Example Tests
• [ ] Increased Test Coverage
• [ ] Added necessary documentation
  • [ ] API documentation
  • [ ] Module documentation in Module.md files
  • [ ] Ballerina By Examples

[codecov[bot]]

Codecov Report

Base: 76.67% // Head: 76.66% // Decreases project coverage by -0.01% :warning:

Coverage data is based on head (686d8ed) compared to base (8b9e0b9). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #38264      +/-   ##
============================================
- Coverage     76.67%   76.66%   -0.02%     
+ Complexity    53120    53113       -7     
============================================
  Files          3355     3355              
  Lines        199345   199366      +21     
  Branches      25874    25885      +11     
============================================
- Hits         152857   152839      -18     
- Misses        37818    37849      +31     
- Partials       8670     8678       +8     

Impacted Files	Coverage Δ
.../compiler/semantics/analyzer/SemanticAnalyzer.java	91.41% <100.00%> (ø)
...llerinalang/compiler/semantics/analyzer/Types.java	81.64% <100.00%> (+0.02%)	:arrow_up:
...eaction/providers/ExtractToFunctionCodeAction.java	86.00% <100.00%> (+0.05%)	:arrow_up:
...eaction/providers/ExtractToLocalVarCodeAction.java	90.00% <100.00%> (+0.16%)	:arrow_up:
...er/tree/expressions/BLangErrorConstructorExpr.java	33.33% <0.00%> (-38.10%)	:arrow_down:
...a/runtime/internal/scheduling/RuntimeRegistry.java	62.26% <0.00%> (-24.53%)	:arrow_down:
...s/context/util/ClassDefinitionNodeContextUtil.java	85.71% <0.00%> (-14.29%)	:arrow_down:
...g/compiler/tree/expressions/BLangTypedescExpr.java	54.54% <0.00%> (-9.10%)	:arrow_down:
...oviders/GenerateModuleForClientDeclCodeAction.java	88.88% <0.00%> (-5.56%)	:arrow_down:
...action/providers/imports/PullModuleCodeAction.java	85.71% <0.00%> (-4.77%)	:arrow_down:
... and 27 more

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