[IMPROVEMENT] Improved navbar and usage of absolute links to icons using site-urls

Description

This MR improves the website layout by incorporating multiple elements: Improvement navbar:

• sizing.md, analysis.md and libraries.md are now removed from the documentation folder and placed at the sizing, analysis and libraries folder as index.md → this makes use of navbar.indexes since there is no necessity for the overview pages anymore which are directly linked now to sizing, analysis and libraries.
• added sticky tabs to keep visible while scrolling
• enabled toc.follow to follow the toc while scrolling (right side)

Related Issue(s)

None

Other Changes

Fixed download page -> was getting_started.md not getting-started.md

Screenshots/Logs

Testing Instructions

Checked locally

Developer Checklist

• Code has been tested locally.
• Minor check was conducted - seems to work properly
• Todo → major check with pipeline.

Additional Notes

Please make sure that the mkdocs site-urls plugin is installed via pipeline. I have it locally installed.

docs/documentation/analysis/index.md

@@ -12,7 +12,7 @@ glightbox: false
 ---
 
 ## Aerodynamic analysis
-![Icon](../assets/images/documentation/calculate-polar.svg){.overview-img  align=left}
+![Icon](site:assets/images/documentation/calculate-polar.svg){.overview-img  align=left}
 The tool `aerodynamic_analysis` calculates, as the tool name suggests, the polars of an aircraft.
 It uses the tool Lifting Line from DLR to calculate force, lift and moment coefficients for each lifting surface of the aircraft.
 These coefficients are used to calculate induced, viscous and wave drag as well as the moment coefficients for the overall aircraft.
@@ -27,7 +27,7 @@ lift mach numbers.
 ---
 
 ## Mission analysis
-![Icon](../assets/images/documentation/mission-analysis.png){.overview-img  align=left}
+![Icon](site:assets/images/documentation/mission-analysis.png){.overview-img  align=left}
 The module `mission_analysis` is the key module of the aircraft performance analysis.
 Its purpose is to calculate the flight trajectory, based on the inputs of the preliminary aircraft design cycle, by solving the aircraft equations of motion being simplified as a point mass model.
 Depending on the method, the fuel consumption is calculated either:
@@ -44,7 +44,7 @@ For the user, possible changes in the module run configuration can be made in th
 ---
 
 ## Weight and balance analysis
-![Icon](../assets/images/documentation/mass-estimation.svg){.overview-img  align=left}
+![Icon](site:assets/images/documentation/mass-estimation.svg){.overview-img  align=left}
 The `weight_and_balance_analysis` module calculates sub-masses and total masses of the aircraft including center of gravities.
 {.overview-item}
 
@@ -55,7 +55,7 @@ The `weight_and_balance_analysis` module calculates sub-masses and total masses
 ---
 
 ## Constraint analysis
-![Icon](../assets/images/documentation/constraint_analysis.svg){.overview-img  align=left}
+![Icon](site:assets/images/documentation/constraint_analysis.svg){.overview-img  align=left}
 The `constraint_analysis` module updates the performance criteria wing loading and thrust-to-weight-ratio based on the calculated aircraft data.
 {.overview-item}
 
@@ -66,7 +66,7 @@ The `constraint_analysis` module updates the performance criteria wing loading a
 ---
 
 ## Ecological assessment
-![Icon](../assets/images/documentation/calculate-emissions.svg){.overview-img  align=left}
+![Icon](site:assets/images/documentation/calculate-emissions.svg){.overview-img  align=left}
 The **ecological_assessment** is an additional module of the UNICADO toolchain.
 Its purpose is to calculate the emissions and energy demand within the aircraft's lifecycle and to determine the missions based climate impact.
 For the user, possible changes in the module run configuration can be made in the related calculateEmissions_conf.xml file.
@@ -83,7 +83,7 @@ The parameters comprised in this XML file can have different attributes as e.g.
 ---
 
 ## Performance assessment
-![Icon](../assets/images/documentation/calculate-performance.svg){.overview-img  align=left}
+![Icon](site:assets/images/documentation/calculate-performance.svg){.overview-img  align=left}
 The module `calculatePerformance` is used to evaluate the mission performance of the design.
 {.overview-item}
 
@@ -94,7 +94,7 @@ The module `calculatePerformance` is used to evaluate the mission performance of
 ---
 
 ## Cost estimation
-![Icon](../assets/images/documentation/cost-estimation.svg){.overview-img  align=left}
+![Icon](site:assets/images/documentation/cost-estimation.svg){.overview-img  align=left}
 This modules calculates the direct operating cost (DOC) of an aircraft.
 Direct costs include all expenses incurred in operating and financing the aircraft: