Remove Jinja dependency for landing page generation

[ml-evs]

Alleviates the issues with the Jinja+aiida dep combination (#1079) by manually constructing and caching the landing page.

The info displayed should be identical, except it is no longer sanitized to check for web-safety of the metadata.

[codecov]

Codecov Report

Merging #1082 (788b1e4) into master (bb3c5a1) will decrease coverage by 0.38%.
The diff coverage is 20.00%.

❗ Current head 788b1e4 differs from pull request most recent head 98ccc21. Consider uploading reports for the commit 98ccc21 to get more accurate results

@@            Coverage Diff             @@
##           master    #1082      +/-   ##
==========================================
- Coverage   92.90%   92.51%   -0.39%     
==========================================
  Files          67       67              
  Lines        3790     3807      +17     
==========================================
+ Hits         3521     3522       +1     
- Misses        269      285      +16     

Flag	Coverage Δ
project	92.51% <20.00%> (-0.39%)	⬇️
validator	92.51% <20.00%> (-0.39%)	⬇️

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

Impacted Files	Coverage Δ
optimade/server/routers/landing.py	38.23% <20.00%> (-32.36%)	⬇️

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[CasperWA]

This essentially looks fine to me - cheers @ml-evs.

I have left some comments and suggested changes, but they are not at all critical - at least not if this works on your end as intended. I can try and test it as well, but if you already did, I trust your work.

[ml-evs]

Have tested this again locally, so will merge without a re-review.

[ml-evs]

😓 https://github.com/Materials-Consortia/optimade-python-tools/runs/5360468940?check_suite_focus=true

Run mike deploy --push --remote origin --branch gh-pages --update-aliases --config-file mkdocs.yml latest master
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.8.12/x64/bin/mike", line 5, in <module>
    from mike.driver import main
  File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/mike/driver.py", line 4, in <module>
    from . import arguments, commands
  File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/mike/commands.py", line 5, in <module>
    from jinja2 import Template
  File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/jinja2/__init__.py", line 12, in <module>
    from .environment import Environment
  File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/jinja2/environment.py", line 25, in <module>
    from .defaults import BLOCK_END_STRING
  File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/jinja2/defaults.py", line 3, in <module>
    from .filters import FILTERS as DEFAULT_FILTERS  # noqa: F401
  File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/jinja2/filters.py", line 13, in <module>
    from markupsafe import soft_unicode
ImportError: cannot import name 'soft_unicode' from 'markupsafe' (/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/markupsafe/__init__.py)
Error: Process completed with exit code 1.

[CasperWA]

Yup. Created issue #1086 for this now :/