Fixing #18, disabling mathjax fast-preview, fixing some typos in "Coordinate systems"

See merge request !39

Fixing floating inline math mode

See merge request !37

can't fix inline offset in CHTML 

Deleted docs/styles/thebelab.css

Merge branch 'enablingsearch' of https://gitlab.kwant-project.org/mathematics-for-quantum-physics/lectures into enablingsearch

Make mathjax default render switch to CommonHTML - enabling x-scroll on overflow on mobile

See merge request !36

Switching to SVG output of mathjax + update titles

See merge request !35

Deleted nbconvert_fix.py, mkdocs.yml, extra_markdown.tpl, execute.py, README.md, .gitlab-ci.yml, theme/main.html, src/code/.keep, src/figures/.keep, src/figures/3_vector_spaces_1.jpg, src/figures/Coordinates_11_0.svg, src/figures/Coordinates_13_0.svg, src/figures/Coordinates_15_0.svg, src/figures/Coordinates_17_0.svg, src/figures/Coordinates_19_0.svg, src/figures/Coordinates_5_0.svg, src/figures/Coordinates_5_1.svg, src/figures/Coordinates_7_0.svg, src/figures/Coordinates_9_0.svg, src/figures/DE2_1.png, src/figures/Phase_portrait_with_cars.png, src/figures/complex_numbers_10_0.svg, src/figures/complex_numbers_11_0.svg, src/figures/complex_numbers_12_0.svg, src/figures/complex_numbers_5_0.svg, src/figures/complex_numbers_8_0.svg, src/figures/shape_polar.svg, src/scripts/mathjaxhelper.js, src/scripts/thebelab-custom.js, src/scripts/thebelabhelper.js, src/styles/thebelab.css, src/1_complex_numbers.md, src/2_coordinates.md, src/3_vector_spaces.md, src/4_vector_spaces_QM.md, src/5_operators_QM.md, src/6_eigenvectors_QM.md, src/7_differential_equations_1.md, src/8_differential_equations_2.md, src/index.md, code/.gitkeep