DOC: Side bar and main page fixes

[rmukh]

Summary

Fixes # .

List of changes proposed in this PR (pull-request)

• Fixes the problem that sidebar blocks are not available and links are not clickable.
• Remove unsupported property from a.navbar. Currently, color: on the main page is empty.

Moved sidebar elements on top of the layout file according to https://github.com/sphinx-doc/sphinx/blob/master/doc/_themes/sphinx13/layout.html

Acknowledgment

• (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[codecov]

Codecov Report

Merging #3397 (5587242) into master (eab4b2a) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@ ## master #3397 +/- ## ======================================= Coverage 65.20% 65.20% ======================================= Files 307 307 Lines 40457 40457 Branches 5350 5350 ======================================= Hits 26379 26379 - Misses 13003 13007 +4  + Partials 1075 1071 -4 

Flag	Coverage Δ
unittests	64.93% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nipype/algorithms/icc.py	57.53% <0.00%> (ø)
nipype/interfaces/fsl/utils.py	63.76% <0.00%> (ø)

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[effigies]

Looks like it works. Thanks!